Quote:
Originally Posted by niko  Stuckintexas,
I run all my CO2 tanks with the CO2 on 24/7. Never had a problem for 7 years now. Just the first night when I turn the CO2 I worry, but it's always in vain. No issues whatsoever.
--Nikolay |
I think it depends on how hard you are driving your plants. If you try to run the maximum concentration of CO2 in the water, over 30 ppm, then the fish can be bothered by it at night, unless you maintain really good water circulation and make sure there is plenty of dissolved oxygen in the water - a little ripple on the surface helps. And, the smaller the fish, the less they seem to be bothered by the CO2.