I would almost guess its aefw, besides that there are asterina stars that will eat acros and red bugs. I would take out a colony out that's dying and dip it, if that's not possible than cut a good size frag off and dip that. In the mean time, purchase another wrasse and start blowing your acros with a turkey baster once a day. Its not gonna eliminate your problem but its should control it.
Other than that, the only thing could kill your acros from top down is Alk swings.
Good luck, fingers crossed its not aefw, but in case it is there are methods to get rid of them, don;t lose hope.
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