What works in nature is dilution. The ocean is big enough that the vast majority of ich theronts never encounter a fish and perish. No such luck in our aquariums. I'm all for biological controls - dusky wrasse for flatworms and pyramid snails as example - but I have seen no evidence, nor have read any credible claims, that a cleaner wrasse will help to control ich. Correlation is not causation. I'd hate to see people encouraged to buy cleaners when the vast majority will not survive.
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Simon
Got back into the hobby ..... planned to keep it simple ..... yeah, right ..... clearly I need a new plan! Pet peeve: anemones host clowns; clowns do not host anemones!
Current Tank Info: 450 Reef; 120 refugium; 60 Frag Tank, 30 Introduction tank; multiple QTs
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