There could be a hitchhiker that comes out when the lights are off and taking them out. I recommend you do some research and see what predators the starfish has. Keep a watchful eye on the tank and be prepared to do some "nighttime" viewing. Good luck and let us know what you find!
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Clarence 
55g sumpless mixed reef(soon to be 120g)
DSB(2 to 6 inches)aprox. 80 lbs,LR aprox. 60 t0 80 lbs.,Coralife 220 Protein Skimmer,CPR HOB Refugium with Fiji Mud
Member of TRS Member of SDMAS
RIP Sarracino Ciro 12/16/04 - 4/3/08
