My acan was growing like crazy for several weeks after I got it (40g breeder, ATI T-5 4 bulb lights, tank’s first coral after being up a year). Right after I added a Nassarius snail, the acan looked bothered, not fully opened up, and stopped growing. The color is fine and it’s feeding fine. I’ve never seen the snail bother it but I’m flummoxed. Params good: Alk 11.5, Ca 490, Mg 1380, ph 7.9-8.1, temp 76.5-78, Nitrates 0, PO4 0. I stopped Nopox to get more nutrients in the water. I did add an Icecap 1k in the meantime and have it on random up to 50%. I realize the acan might be getting used to more flow, but it started getting cranky the day I added the snails. Can anyone make sense of this? I’m an experienced aquarist but am still learning the ropes about corals. Any help is greatly appreciated!!