I examined this frag under high magnification and found the little clove polyps were completely suffocating the Tubs Zoas and completely encrusted them with new little polyp starts. I tried to dip and eliminate the clove polyps but they continued to survive. Unfortunately, it looks like I'll have to sacrifice the Tubs to prevent spreading of the invasive clove polyps.
I'm trying one last radical treatment before giving up but I don't hold out much hope. I've taken the frag out of the tank and left it exposed to air for about 30 minutes, then used a tooth brush to scrub the surface of the frag and returned it to the tank after rinsing in tank water. As expected, the zoas completely closed up during the process and hopefully, I may have removed the clove polyps with the brush. The frag is now back in the tank and I do NOT see any clove polyps opening. I don't see any of the Tubs opening, as yet either.
