I have a few different Zoa's in my 55 gallon tank. I am running a 4 bulb T5 HO lighting system, a refugium with no skimmer, I was changing 15-20 gallons of water once a month and topping off with my well water. I just changed the top off to RO water. I also dose twice a week with part A & B Reef Replenish. My question is that I cannot get my Zoa's to open and would like to know if anyone on here has had this issue and what they did to get them to open up?
Here are some pictures of them.
Here are some pictures of them.