I have had the same thing happen lately, I have had zoas for a couple of years, they were doing great, spreading looking beautiful then all of a sudden started shrinking.
I have been experimenting, I moved 2 colonies up in my tank where there is more flow, I left 2 colonies where they were and have done nothing but blow them off a bit and I moved 2 colonies out to a 10g and have been doing furan2 dips for pox, this was a little over a week ago. The 2 I moved up look bad, from the 2 I moved out, 1 looks a little better the other looks the same, the ones I left in place look the best, go figure. I have vitamin c on order and will start dosing soon, hope it helps.
My skimmer has not been at its top performance lately and I also run biopellets, I am wondering if its to do with bacteria in the tank.
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