how to aerat a tank without to much surface movement?
ok i may just be worried but when i add my pressurized co2 i will cup down on surface movement. now since this is where gas is exchanged, im not worried about loseing co2 but gaining O2. how do yall achieve this?
and just as another question how long would a 20lb cylinder last for 4 tanks a 55 29 40 and 35 ty