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Are you using air stone's?
With flood and drain,I find it's best not to run too much air thru your res.You will get air in your water from "collision", shorten your drain hose enough that it's above your res water level,that should be enough air.I used to run air stone's in my res,but I stopped becouse it make's the PH and PPM go crazy,And also causes the algae to grow way faster.With flood and drain,you cycle the water atleast twice a day...so it doesn't get stale like other method's will.
Dive:stoned
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