Elegance Coral vs. Sea Hare

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Just wondering here......... I bought a sea hare yesterday, brought him home, aclimated him, and put him onto some algae in my tank. He did some eating, but not too much. Last night he started up again, but then fell off where he was and landed right in the middle of my elegance coral. I saw it all happen, so I was pretty quick to get hinm outta there, but the elegance was already "sticking" to him. Today the hare is t1ts up. Was the sting from the elegance what did him in? Or was it something else in the tank?