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Come to think of it, according to my log, I treated the system with Red Slime Remover to treat a cyano outbreak that I was able to stop but not eliminate with new PhosBan, multiple water changes, water flow and skimming. That was about a week before the ORP reduction. Could the RS Remover have killed the sand allowing it to release ORP reducing compounds? Problem is, here we are several days later and ORP seems to have stabilized in the 300 range, neither improving or worsening.
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