I had the exact same issue. It got to the point that when I would spot feed my acans they would come out during the day. Pods will eat zoas, theres a good vid on youtube of them doing it. I was down to my last radioactive dragon eye.
My only solution to you is what you did and to get a 6 line wrasse or something along those lines. I picked up a 6 line and he went to work right away and was a chubby little bugger. Never had any issues after that.
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