I have no idea what is going on. My 5 gallon is about a year established and everything in my tank is growing super well and my established so colonies are getting about a polyp a week. However any time I add a new zoa they just will not open. I’ve added new Gonis a hammer and mushrooms and they are all open and super happy first day putting them in and have never closed up once. However new zoas just do not like my tank. I’ve dipped them with coral Rx and Lugol. However no idea. Again my established zoa colonies are popping a head a week. Any thoughts? I’m stumped.