I dunno about the zoas, but is that a bit of bubble algae I see in there? Weird that only some of them on the rock bleach, while the other colonies are fine.
I said the same think Riona (about the bleaching) yeah there is some bubble algae. I have an emerald crab in the tank, he wants nothing to do with it. Someone also said that the "yellow" ones are really brown. They turned yellow because of the lack of light. I have them under 130 watts now in my 15gal so they should be happy. I'll see what happenes in a few months
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