Keeping starfish in reef.

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I'm sure there's some starfish that will do okay (thinking serpents and Chocolate Chip) but would say if your looking at one that no-one knows what it eats (or can't maintain a food supply), probably stay away.

I had a Blue Linckia for 23 months, did notice it eating some black sponge. Problem there was it clean the patches off and the sponge never grew back.