My vote is for sandsifting stars. I have had gobies in the past that have covered corals with sand. The starfish works just as well. I have had Linckia stars and red sea stars eaten by something in my tank (possilby one of the surgeon fish) but nothing has bothered my sandsifter.
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300 gal starphire custom built in pentagon reef (+90 gal sump on Blue Line 100 HD return pump, 210lb LR, Euro-Reef RC250 skimmer, 2x400W MH, 2x28W compacts, 2xTurbelle classic 4002 pumps & Turbelle Stream 6100 on 7095 Multicontroller, running ZEOvit)
Livestock
Fish: damsels; sailfin, yellow, regal & naso tangs; ocellaris & tomato clowns; lyretail anthias; foxface lo; flame angelfish
corals: a few
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