I purchased 3 Dispar Anthias the 27th and yesterday one started swimming in an odd pattern. Sometimes swimming belly to belly with the other anthias and then around them, but in a perfect circle. Even upside down when it goes under. It is only sometimes and is eating and swimming through the column just fine. Is this a normal swimming pattern for them? It is kind of cool to watch, just not quick enough on the camera to catch it. Or should I be watching closely for a swim bladder issue?