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They generally only move if something's bothering them. 2 most likely candidates are water quality and lighting. Some info on the tank would help, params, age, lighting, flow?
It's a 55 reef. 2 Led fixtures. Blue n white. (165) watt. Water is ro. Tested every three days. Flow is two powerheads at top. At first it was in med flow. It moved. Then changed to low flow. It moved. ?