I have a hammer coral that started with 2 heads. About 4 weeks ago it split into 3 heads. Unfortunately I had to move it to a different place in the tank. It is a 90 gallon tank that is 24" tall. I have a sleeper goby that keeps knocking it over. I put it up close to the rock work with a small piece of LR in front of it. One of the heads has completely receded and the other 2 are not doing so well. I can post a pic later tonight. Any thoughts as to the cause or cure?