Same thing would happen in a DWC if you didn't have air stones.
I always add H2O2 to my tanks. Trick is, ya gotta do it at least every third day 'cause the H2O2 loses its extra oxygen atom and turns into plain old H20.My new solution has 15ml of hydrogen peroxide per gallon. That might prevent a reoccurrence. I needed to correct this asap.
Thanks! Bubbler is installed and running.I asked if it was stagnant because most folks do put a bubbler in any solution that will hit the plant.
@Hippie420 I always ran h2o2 in my bubbler tubs too.
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