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Originally Posted by Edward You don’t run air stone, do you? There should be an air stone if there is fish to exchange gasses and keep the water fresh. Adjust it to the minimum possible flow. I haven’t notice pH fluctuations. |
So you are running an airstone and CO2 both on lower levels 24/7? That's a very interesting approach. I may have to try that sometime.
Are you using RO water to get a KH of 0 and then adding only GH back for the plants?