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#1
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PMDD dosing question
I've set up my planted tank after a hiatus of 3 years and have forgotten
some basic facts. 56 l tank 1W/ l lighting. DIY CO2 achieving 20ppm. moderately dense planting with Limnophila sessiflora and unknown (to me), medium-sized Echinodorus. dosing with 4 drops PMDD per day laterite balls under the swords; coarse gravel substrate. Plants pearling a lot and growing quite well. A stable, tiny patch of cyanobacteria (on a plant stem at the surface right under a light) and a bit more filamentous green algae than I'd like. Some BBA fading away. No fish yet. The NO3 and Fe remain unmeasurable after 2 weeks of this regimen. What levels of both of these nutrients are desirable? Anyone want to take a stab at an appropriate PMDD dosing rate? Thanks in advance, Nick. |
#2
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"Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... I've set up my planted tank after a hiatus of 3 years and have forgotten some basic facts. 56 l tank 1W/ l lighting. DIY CO2 achieving 20ppm. moderately dense planting with Limnophila sessiflora and unknown (to me), medium-sized Echinodorus. dosing with 4 drops PMDD per day laterite balls under the swords; coarse gravel substrate. Plants pearling a lot and growing quite well. A stable, tiny patch of cyanobacteria (on a plant stem at the surface right under a light) and a bit more filamentous green algae than I'd like. Some BBA fading away. No fish yet. The NO3 and Fe remain unmeasurable after 2 weeks of this regimen. What levels of both of these nutrients are desirable? Anyone want to take a stab at an appropriate PMDD dosing rate? Thanks in advance, Nick. I think the recommended dose is 2 drops per 10 gallons so you are in the ball park. Rick |
#3
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I just went through this. Very frustrating. I was way way underdosing at
first. You should use the fertilizer calculator to see how much you're actually adding to the tank in ppm with the solution you've made. http://atlas.csd.net/~cgadd/aqua/art...osage_calc.htm I just ran it at 1 tsp KNO3 in 300ml water (per the recipe) and it said that 1ml would add ..05ppm nitrates, and you're just adding drops! PMDD seems to be adding such a tiny amount, I don't quite understand how you're supposed to get the levels up. I've made a solution with just nitrates (I use the stump remover). I have a 55 gallon, and I mixed 6 Tbsp (6 Tbsps!) with 250 ml of water, which is supposed to be 1.2 ppm per ml added to the tank. I'm adding 20ml a day just to keep my levels at around 5ppm. I need to test the solution to see if it's really as strong as the calculator says it is, I'm suspicious that it's weaker. Anyway, according to a poster in this group, a heavily planted aquarium can consume 10ppm per day, so at the pmdd rates, you're not even teasing them. I wish someone else here could explain this. I've often wondered why the recipe seems so weak. Good luck! Allison "Rick" wrote in message ... "Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... I've set up my planted tank after a hiatus of 3 years and have forgotten some basic facts. 56 l tank 1W/ l lighting. DIY CO2 achieving 20ppm. moderately dense planting with Limnophila sessiflora and unknown (to me), medium-sized Echinodorus. dosing with 4 drops PMDD per day laterite balls under the swords; coarse gravel substrate. Plants pearling a lot and growing quite well. A stable, tiny patch of cyanobacteria (on a plant stem at the surface right under a light) and a bit more filamentous green algae than I'd like. Some BBA fading away. No fish yet. The NO3 and Fe remain unmeasurable after 2 weeks of this regimen. What levels of both of these nutrients are desirable? Anyone want to take a stab at an appropriate PMDD dosing rate? Thanks in advance, Nick. I think the recommended dose is 2 drops per 10 gallons so you are in the ball park. Rick |
#4
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It seems I should be using 1.5ml/day, according to the Sears/Conlin paper.
30 drops/day ? "Allyb" wrote in message ... I just went through this. Very frustrating. I was way way underdosing at first. You should use the fertilizer calculator to see how much you're actually adding to the tank in ppm with the solution you've made. http://atlas.csd.net/~cgadd/aqua/art...osage_calc.htm I just ran it at 1 tsp KNO3 in 300ml water (per the recipe) and it said that 1ml would add .05ppm nitrates, and you're just adding drops! PMDD seems to be adding such a tiny amount, I don't quite understand how you're supposed to get the levels up. I've made a solution with just nitrates (I use the stump remover). I have a 55 gallon, and I mixed 6 Tbsp (6 Tbsps!) with 250 ml of water, which is supposed to be 1.2 ppm per ml added to the tank. I'm adding 20ml a day just to keep my levels at around 5ppm. I need to test the solution to see if it's really as strong as the calculator says it is, I'm suspicious that it's weaker. Anyway, according to a poster in this group, a heavily planted aquarium can consume 10ppm per day, so at the pmdd rates, you're not even teasing them. I wish someone else here could explain this. I've often wondered why the recipe seems so weak. Good luck! Allison "Rick" wrote in message ... "Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... I've set up my planted tank after a hiatus of 3 years and have forgotten some basic facts. 56 l tank 1W/ l lighting. DIY CO2 achieving 20ppm. moderately dense planting with Limnophila sessiflora and unknown (to me), medium-sized Echinodorus. dosing with 4 drops PMDD per day laterite balls under the swords; coarse gravel substrate. Plants pearling a lot and growing quite well. A stable, tiny patch of cyanobacteria (on a plant stem at the surface right under a light) and a bit more filamentous green algae than I'd like. Some BBA fading away. No fish yet. The NO3 and Fe remain unmeasurable after 2 weeks of this regimen. What levels of both of these nutrients are desirable? Anyone want to take a stab at an appropriate PMDD dosing rate? Thanks in advance, Nick. I think the recommended dose is 2 drops per 10 gallons so you are in the ball park. Rick |
#5
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Go for 2 ml a day, or 4 ml every 2 days etc etc. -- **So long, and thanks for all the fish!** "Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... It seems I should be using 1.5ml/day, according to the Sears/Conlin paper. 30 drops/day ? "Allyb" wrote in message ... I just went through this. Very frustrating. I was way way underdosing at first. You should use the fertilizer calculator to see how much you're actually adding to the tank in ppm with the solution you've made. http://atlas.csd.net/~cgadd/aqua/art...osage_calc.htm I just ran it at 1 tsp KNO3 in 300ml water (per the recipe) and it said that 1ml would add .05ppm nitrates, and you're just adding drops! PMDD seems to be adding such a tiny amount, I don't quite understand how you're supposed to get the levels up. I've made a solution with just nitrates (I use the stump remover). I have a 55 gallon, and I mixed 6 Tbsp (6 Tbsps!) with 250 ml of water, which is supposed to be 1.2 ppm per ml added to the tank. I'm adding 20ml a day just to keep my levels at around 5ppm. I need to test the solution to see if it's really as strong as the calculator says it is, I'm suspicious that it's weaker. Anyway, according to a poster in this group, a heavily planted aquarium can consume 10ppm per day, so at the pmdd rates, you're not even teasing them. I wish someone else here could explain this. I've often wondered why the recipe seems so weak. Good luck! Allison "Rick" wrote in message ... "Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... I've set up my planted tank after a hiatus of 3 years and have forgotten some basic facts. 56 l tank 1W/ l lighting. DIY CO2 achieving 20ppm. moderately dense planting with Limnophila sessiflora and unknown (to me), medium-sized Echinodorus. dosing with 4 drops PMDD per day laterite balls under the swords; coarse gravel substrate. Plants pearling a lot and growing quite well. A stable, tiny patch of cyanobacteria (on a plant stem at the surface right under a light) and a bit more filamentous green algae than I'd like. Some BBA fading away. No fish yet. The NO3 and Fe remain unmeasurable after 2 weeks of this regimen. What levels of both of these nutrients are desirable? Anyone want to take a stab at an appropriate PMDD dosing rate? Thanks in advance, Nick. I think the recommended dose is 2 drops per 10 gallons so you are in the ball park. Rick |
#6
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"Happy'Cam'per" wrote in message ... Go for 2 ml a day, or 4 ml every 2 days etc etc. -- **So long, and thanks for all the fish!** "Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... It seems I should be using 1.5ml/day, according to the Sears/Conlin paper. 30 drops/day ? "Allyb" wrote in message ... I just went through this. Very frustrating. I was way way underdosing at first. You should use the fertilizer calculator to see how much you're actually adding to the tank in ppm with the solution you've made. http://atlas.csd.net/~cgadd/aqua/art...osage_calc.htm I just ran it at 1 tsp KNO3 in 300ml water (per the recipe) and it said that 1ml would add .05ppm nitrates, and you're just adding drops! PMDD seems to be adding such a tiny amount, I don't quite understand how you're supposed to get the levels up. I've made a solution with just nitrates (I use the stump remover). I have a 55 gallon, and I mixed 6 Tbsp (6 Tbsps!) with 250 ml of water, which is supposed to be 1.2 ppm per ml added to the tank. I'm adding 20ml a day just to keep my levels at around 5ppm. I need to test the solution to see if it's really as strong as the calculator says it is, I'm suspicious that it's weaker. Anyway, according to a poster in this group, a heavily planted aquarium can consume 10ppm per day, so at the pmdd rates, you're not even teasing them. I wish someone else here could explain this. I've often wondered why the recipe seems so weak. Good luck! Allison "Rick" wrote in message ... "Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... I've set up my planted tank after a hiatus of 3 years and have forgotten some basic facts. 56 l tank 1W/ l lighting. DIY CO2 achieving 20ppm. moderately dense planting with Limnophila sessiflora and unknown (to me), medium-sized Echinodorus. dosing with 4 drops PMDD per day laterite balls under the swords; coarse gravel substrate. Plants pearling a lot and growing quite well. A stable, tiny patch of cyanobacteria (on a plant stem at the surface right under a light) and a bit more filamentous green algae than I'd like. Some BBA fading away. No fish yet. The NO3 and Fe remain unmeasurable after 2 weeks of this regimen. What levels of both of these nutrients are desirable? Anyone want to take a stab at an appropriate PMDD dosing rate? Thanks in advance, Nick. I think the recommended dose is 2 drops per 10 gallons so you are in the ball park. Rick from the Krib site, using the Sears and Conlin. I dose 2 drops per 10 gallons. YMMV Rick As a starting point, here's a three point plan for setting PMDD doses. The amount or "size" in ml (milli-liters) of your daily PMDD dose should eventually be governed by monitoring Fe (iron) levels that accumulate and equilibrate in your aquarium over a period of time (more on this later). But, to get started, for each ten gallons, try around 1/12 ml of PMDD a day (roughly 2 drops). A 29 gallon tank would then get 1/4 ml a day (roughly 6 drops). If you don't do many partial water changes, dose less. If you have a "high tech", densely planted, CO2 injected, VHO lit tank, you might want to double the dose to 1/6 ml of PMDD per 10 gallons a day (roughly 4 drops). Most of the PMDD nutrient ratios set by Conlin and Sears will work for a variety of conditions. PMDD has been deliberately formulated so that if aquarium Fe concentration is proper, other nutrient concentrations should fall into place. Really, the only common exception to this is NO3 (nitrate); you may need to tinker with the ratio of KNO3 to other PMDD ingredients. Adjusting this ratio will eventually be governed by NO3 levels that accumulate and equilibrate in your aquarium over a period of time (more on this later). To get started, if you have around 5mg/ltr of natural NO3 already in your aquarium, initially use the standard 1 tablespoon KNO3 per 1/2 liter PMDD mix. If your natural NO3 is much higher, initially don't add any KNO3 to your PMDD. If you have next to no NO3, you might initially boost the KNO3 to 2 or even 3 tablespoons per 1/2 liter of PMDD. Lastly, as you go along, you'll need to monitor buildup of Fe and NO3 in your aquarium. Then, watch how plants and unwanted algae respond. As each daily dose adds nutrients, a portion of some will accumulate until eventually you'll reach an equilibrium level. This ramp up and stabilizing process will take awhile (weeks) to occur. Be prepared to adjust your dosage size and KNO3 ratio as you gather feedback. |
#7
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So the PMDD doses recommended vary from 2 to 40 drops per day for a 54 l
tank? All I can say is that 4drops/day has not yet allowed measurable iron or nitrate in the tank. I'll experiment. Nick. " Go for 2 ml a day, or 4 ml every 2 days etc etc. -- **So long, and thanks for all the fish!** "Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... It seems I should be using 1.5ml/day, according to the Sears/Conlin paper. 30 drops/day ? "Allyb" wrote in message ... I just went through this. Very frustrating. I was way way underdosing at first. You should use the fertilizer calculator to see how much you're actually adding to the tank in ppm with the solution you've made. http://atlas.csd.net/~cgadd/aqua/art...osage_calc.htm I just ran it at 1 tsp KNO3 in 300ml water (per the recipe) and it said that 1ml would add .05ppm nitrates, and you're just adding drops! PMDD seems to be adding such a tiny amount, I don't quite understand how you're supposed to get the levels up. I've made a solution with just nitrates (I use the stump remover). I have a 55 gallon, and I mixed 6 Tbsp (6 Tbsps!) with 250 ml of water, which is supposed to be 1.2 ppm per ml added to the tank. I'm adding 20ml a day just to keep my levels at around 5ppm. I need to test the solution to see if it's really as strong as the calculator says it is, I'm suspicious that it's weaker. Anyway, according to a poster in this group, a heavily planted aquarium can consume 10ppm per day, so at the pmdd rates, you're not even teasing them. I wish someone else here could explain this. I've often wondered why the recipe seems so weak. Good luck! Allison "Rick" wrote in message ... "Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... I've set up my planted tank after a hiatus of 3 years and have forgotten some basic facts. 56 l tank 1W/ l lighting. DIY CO2 achieving 20ppm. moderately dense planting with Limnophila sessiflora and unknown (to me), medium-sized Echinodorus. dosing with 4 drops PMDD per day laterite balls under the swords; coarse gravel substrate. Plants pearling a lot and growing quite well. A stable, tiny patch of cyanobacteria (on a plant stem at the surface right under a light) and a bit more filamentous green algae than I'd like. Some BBA fading away. No fish yet. The NO3 and Fe remain unmeasurable after 2 weeks of this regimen. What levels of both of these nutrients are desirable? Anyone want to take a stab at an appropriate PMDD dosing rate? Thanks in advance, Nick. I think the recommended dose is 2 drops per 10 gallons so you are in the ball park. Rick from the Krib site, using the Sears and Conlin. I dose 2 drops per 10 gallons. YMMV Rick As a starting point, here's a three point plan for setting PMDD doses. The amount or "size" in ml (milli-liters) of your daily PMDD dose should eventually be governed by monitoring Fe (iron) levels that accumulate and equilibrate in your aquarium over a period of time (more on this later). But, to get started, for each ten gallons, try around 1/12 ml of PMDD a day (roughly 2 drops). A 29 gallon tank would then get 1/4 ml a day (roughly 6 drops). If you don't do many partial water changes, dose less. If you have a "high tech", densely planted, CO2 injected, VHO lit tank, you might want to double the dose to 1/6 ml of PMDD per 10 gallons a day (roughly 4 drops). Most of the PMDD nutrient ratios set by Conlin and Sears will work for a variety of conditions. PMDD has been deliberately formulated so that if aquarium Fe concentration is proper, other nutrient concentrations should fall into place. Really, the only common exception to this is NO3 (nitrate); you may need to tinker with the ratio of KNO3 to other PMDD ingredients. Adjusting this ratio will eventually be governed by NO3 levels that accumulate and equilibrate in your aquarium over a period of time (more on this later). To get started, if you have around 5mg/ltr of natural NO3 already in your aquarium, initially use the standard 1 tablespoon KNO3 per 1/2 liter PMDD mix. If your natural NO3 is much higher, initially don't add any KNO3 to your PMDD. If you have next to no NO3, you might initially boost the KNO3 to 2 or even 3 tablespoons per 1/2 liter of PMDD. Lastly, as you go along, you'll need to monitor buildup of Fe and NO3 in your aquarium. Then, watch how plants and unwanted algae respond. As each daily dose adds nutrients, a portion of some will accumulate until eventually you'll reach an equilibrium level. This ramp up and stabilizing process will take awhile (weeks) to occur. Be prepared to adjust your dosage size and KNO3 ratio as you gather feedback. |
#8
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"Nicholas Murray" arwenick"AT"acay.com.au wrote in message ... So the PMDD doses recommended vary from 2 to 40 drops per day for a 54 l tank? All I can say is that 4drops/day has not yet allowed measurable iron or nitrate in the tank. I'll experiment. Nick. and experiment is what you have to do. I use the 2 drops per 10 gallon rule in my 77g planted tank however I also dry dose some ferts in particular KN03 to keep my levels up. There are a lot of variables such as density of planting, amount of growth etc. The dose rate is simply a starting guideline. INHO 40 drops in 54 litres of PMDD will simply result in a major algae outbreak however YMMV. Rick |
#9
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"Nicholas Murray" arwenick"AT"acay.com.au wrote in message ...
So the PMDD doses recommended vary from 2 to 40 drops per day for a 54 l tank? All I can say is that 4drops/day has not yet allowed measurable iron or nitrate in the tank. I'll experiment. Nick. You might find that adding this will not supply the things you need for good plant growth if you have CO2 injection. This was based on the premise that PO4 and Fe at non limiting levels(for plants) will cause algae. This is not true. This was also devised for low light tanks, 1.5-2w/gal of normal output FL's lights. It also suggest low CO2, 10-15ppm or so, 20-30ppm is better. Many folks need to add PO4 to have good growth, unless your tap water has 1.0ppm or more and you do 50% weekly changes, you'll need to add it as well. http://www.aquatic-plants.org/est_index1.html Regards, Tom Barr |
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