i had my achilles in the QT for a week. then when i added a bicolor angel, it chased the bicolor, bumping it and circling it nonstop. that only lasted a day though.
so you have the achilles in the DT and its chasing the Anthias? now ich is showing on the achilles again? i dont think it was fully recovered to begin with.
The chasing didn't make it come back again -- if the tang was in the main tank when I first show ick, and you never had the main tank fallow for 6-8 weeks; the ick never left the main tank and will, most likely, always come back.
There might never be peace in there with an Achilles in a 4 ft tank. It's a bad call. Those fish can be agressive in a large tank. Need 200 gals at least for one of those. A smaller species of tang would be better suited and better behaved.
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