How much CO2 is too much?
CO2 concentration in water shouldn't effect O2 concentration, does it?
Let's say that if I do not want to use chemical means to lower my pH, and want to rely solely on CO2 to keep my water slightly acidic. My present tap pH is 7.6, KH 4, and if I keep dumping CO2 into water to drop the pH till it stablizes at 6.8. Would too much CO2 in the water kill my fish by blood acidosis?
Is acidosis only occur when pH of the water falls significantly below 6? What would happen to planted tank if you have too much CO2? Is pH drop the down side to have too much CO2 in the tank?