Does anybody else have a problem with their blastomussas dying for no apparent reason? I've had mine for 4-6 months and some have started to receed. It starts with one polyp, then another. Remaining polyps are open and look healthy. They are under med-low light and medium flow. I feed them mysis sometimes. I moved some to my prop tank to see if the reduced flow will help. SPS and other lps look great. Is there anything I can try to help them heal?