I had a similar experience, I couldn't get the iron level up to the
recommended 0.3mg/l so I changed to Hagen's "Nutrafin Plant Grow- Iron
Enriched" I got the iron levels up to the recommended level by adding 25ml
to a 170 litre tank. I now add about 10 ml once a fortnight after I do a
partial water change, the other week I use my old fertilizer as it does have
some different trace elements. I have noticed a marked difference to the
colour of my plants, they now look very green and lush as before the were
more a khaki colour. I regularly test and my level is between 0.25 - 0.5
Be careful with its use as too much iron isn't beneficial to fish.


"Troy Bruder" wrote in message
...
Hello,

I have a 27 gallon fresh water planted tank... Plants have been doing
fairly well over the last year, but have never really been thriving...
After much testing, I discovered that I have an iron deficiency in the
water... I have been using the Red Sea "Plant Success" products for a
year... The recommended dose of FE is 5 ml per 60 gallons every week..

Here's the problem... I have a test kit which shows ZERO FE in the water
after doing this for at least a YEAR.. Over the last week or so, I have
added over 600 ml of FE to the water and still can't get a reading
(actually, I think it's reading .1 ppm right now)... What gives?!?!?

I have an external canister filter with no active carbon... Only ceramic
pre-filter media and filter pads (Fluval 204)..

Any ideas for me??

Other info:

CO2 injection; Ph=6.8-7.0; DKh = 5; Temp = 79-82

(If anyone can help me identify the plants too, that would be great!)

Thanks,
Troy