Well Brad ... IMO your tang never got rid of the ich in the first place ... maybe only one or 2 that you might not notice ... even in the gills where you cant see it ... but being healthy the ich does not take a stronghold till he gets stressed and then boom ... they break out
If the fish are healthy I think you can have ich in your tank and they can deal with it but the best situation would be to eliminate it altogether so they can deal with a little stress ( our hands in the tank for instance )
Cheers
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Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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