I've read anything over 30ppm of CO2 is bad for fish. I just now realized that people have different methods of putting their CO2 intake line in the tank so not everyones method will diffuse CO2 in their tanks effeciently. So I think BPS is inaccurate now that I think about it. According to some charts, I have a CO2 ppm of 39-41... and a third of my fish are at the top of the tank. Im working on lowering it as of right now.I keep seeing people state the number of bubbles per second of CO2 they are injecting into their tanks - with all the different sizes of tanks and different kinds of diffusion methods, what value is the rate?