Doesn't work. It's not powerful enough to kill them, invertebrates, judging by the fact that it doesn't work on coral, shrimp, snails or crabs. Anything that really kills them also kills the inverts. My help partially affected the fish, but you probably use this on rallies as well. Rally does contain a strong drug that works against flukes etc., but again not in this concentration. Remember to unplug both your skimmer and carbon/UV so the ORP or oxygen will be lower which can kill already infected fish. I've tried this as a last resort for having corals and inverts in my body, but it doesn't seem to be an effective treatment.
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