Im convinced they eat zoas. No matter their type.
Most people say the zoas are probably dying which is why the stars are munching on them.
But i have hundreds of these stars in my tank and they dont touch any corals i own. But when i kept zoas i too would find them on the zoa then the zoas gone by morning. I always see my stars hanging around patches of glass that have i missed with the algae magnet.
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