My guess is that you have a leak in the system, but not a big one...you still
get enough CO2 through when its at maximum production, but as soon as it slows
down, you lose all the CO2 through the leak.

Rich

"Dave M. Picklyk" wrote:

In our 48 gallon tank at work I've started to inject C02. I'm doing the DIY
method with 2 2L bottles. Unfortunetly, I can only sustain a c02 content of
about 15ppm for a couple days and then it dies off. The floor where the
bottles sit is concrete, and there is a hollow space under that floor as
well (cool air underneath). Are the bottles cooling off too much and
hindering effective C02 production?

Or is there something wrong with the recipes. We've tried many different
measurements of sugar and yeast...even 4 cups of sugar to about a teaspoon
of yeast. It seems to fizzle out really nice and fast for the first few days
and then peters out. I'm sure the sugar isn't used up THAT fast.

Any suggestions for DIY for bigger tanks like 48gallon?
Thanx!!!!
--
Dave Picklyk
www.picklyk.com/aquascape

I have a 15 gallon aquarium and keep it 25-30ppm no problem for almost 2
weeks with just regular baker's yeast.

Thanx for the idea about the reptile heating pads...I think I'll do that for
the concrete floor.

--
Dave Picklyk
www.picklyk.com/aquascape

"SLEngst" wrote in message
...
For heating, I've found that reptile tank heating pads work well for
mainting
CO2 bottles at a nice warm temperature. I put them in a box under the
bottles
and stuff insulation around the bottles.

Why your CO2 is fizzling out so soon, I don't know except, perhaps the
type of
yeast. I mix regular bakers yeast with a Canadian wine yeast. Bakers
yeast has
a quick take off; the wine yeast last longer. If you need the brand name
of
the wine yeast, let me know.

Hope this helps.

For heating, I've found that reptile tank heating pads work well for mainting
CO2 bottles at a nice warm temperature. I put them in a box under the bottles
and stuff insulation around the bottles.

Why your CO2 is fizzling out so soon, I don't know except, perhaps the type of
yeast. I mix regular bakers yeast with a Canadian wine yeast. Bakers yeast has
a quick take off; the wine yeast last longer. If you need the brand name of
the wine yeast, let me know.

Hope this helps.

"Dave M. Picklyk" wrote:

I have a 15 gallon aquarium and keep it 25-30ppm no problem for almost 2
weeks with just regular baker's yeast.

Thanx for the idea about the reptile heating pads...I think I'll do that for
the concrete floor.

At under $100 for bottled CO2, money spent on heating pads and electricity
starts to add up. Just a thought.