Utter Chaos Zoa until recently was doing quite well. Then all of a sudden they’re not quite opening. I had moved them due to the invasion by other Zoas but didn’t like their new location. Now I’ve moved them back but still closed. Any ideas?
Check the bases for little white spots. Might be zoa pox. You mentioned other zoas. Are your other zoas thriving? Zoas need a "dirtier" tank in order to flourish. What are your parameters?
