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+1 ^Looks very suspect. If that's the only frag of zoas showing signs I would remove it from the display.
Agreed. Looks just like a pimple. It’s pretty easy to burst too just don’t do it IN the tank. Best luck I’ve had was to pop them while in the pox treatment and use lots of flow. Some were too far gone but just cut those off and save the rest. I lost about 50% of my zoas at one point due to pox. Now I’m super vigilant.If its zoa pox get that out of your tank and treat all your zoas ASAP. We bought a frag of Zoas at a frag swap and put it in our tank and 2 weeks later every Zoa had it. We lost so many amazing Zoas. If it looks like a pimple can't tell by the pic good luck. Hopefully, you have a small tank because you'll have to dip every Zoa