10-25-2008, 01:10 PM
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Hey kkaso.... In spite of the fact that you probably spent a good chunk o' $ on the pH controller, it won't necessarily give you accurate CO2 levels. Those test the tank pH which has stuff (technical term) other than CO2 that affect pH readings, so they tend to leave you with less CO2 than you think. Drop checkers, while not perfect, are more accurate as they have the 4 dKH solution instead of tank water. Here's a good article about drop checkers and CO2. Drop Checkers/CO2 Indicators-Why and How - Aquarium Plants - Barr Report
This is an excellent forum for all kinds of planted tank info, btw.
Personally I prefer the drop checker/timer setup so it shuts off at night when it's not needed and I can see the CO2 level at any given time.
As far as bubbles per second, it will vary greatly with setup, surface agitation, reactor efficiency, etc. I have a 92G with an external inline reactor and I run about 6 or 7 bubbles per second (sounds like alot, I know) and hold around 25 ppm. As a BALLPARK GUESS, I would expect around 3-4 bps in your 55G. Like I said, it varies. Pretty much you want to try to get the plants to pearl and at the same time have no fish gasping at the surface or showing other signs of oxygen shortage. Good luck!
Last edited by steelerfan; 10-25-2008 at 01:13 PM..