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Is he going to the top and leaning back once he gets to the top of the tank? A lot of starfish do this, but are not climbing out of the tank. If you are really worried, just cut some egg crate or something to close the top off.
I think these guys are so awesome they know when its feeding time cause he sticks his arms out to catch food whenever i feed the fish. its awesome. somtimes i just stick the clam right in his mouth