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Discussion Starter · #1 ·
Noticed that the tangs are rubbing against the rocks and even the perculas are rubbing on the sand a bit......did an ALK test and got a reading of 11 (.28) which seems really high. Will do a 10G water change but how else to you lower ALK?

Also - is this why the fish are "scratching" or are they just being fish and I'm just being paranoid?
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