SisterMaryElephant wrote:I'm glad it's not temp related but try cutting the h2o2 (in half or completely) for a little while, it could be too strong. I think you fixed the light leaking through the system so I doubt that's it. I assume PH is checked and good.
It could be too much water flow diluting the DO. Do you also run a stone/pump in the reservoir? While one stone per leg may be enough in standing water, is it enough for moving water? Submerged roots need a lot of air. *shrug*
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