The other day my Xenia started to dip, not all of it just a piece. At first I thought it was just splitting but today I notice some yellow decay where it was sagging. I did not feed my peppermint shrimp the other night. Is it possible they chewed on my Xenia? Most of it is still pulsing and I added some Iodine. I want to avois a Xenia crash, is there anything I can do? It is on its on little rock so I could move it to a Q tank but that is a FO tank, no LR. Should I just wait it out?