Sometimes the copper in the water bothers the fish's skin. It can make them want to scratch their skin.
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Thanks. I’ve actually put in about 5 lbs of LR along with the bubble filter after soaking in my sump for a while. Cycling in my QT hasn’t been an issue, however I do monitor my copper closely as I know the rock will absorb some of it.
for the next round of fish I empty, toss the rock and start anew with a seeded sponge again. Will add a small powerhead the next time.