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I recently bought a urchin that dies one day after I put it in the tank, it dropped all its spines and died. Also about 3 months ago I bought an urchin that did the same thing. I can't figure out why they are dying. Does anyone have a clue of why they might be dying.

I have a hammer coral that is starting to look nothing like at least the pictures I've seen of a hammer coral. Is this normal? (I'll post a picture in a couple of days when I Can) but the tentacles on the head are small and spread out not bushy and thick like I usually see hammer corals.