Urchins, Decorator Crab

I've lost a few fish lately and don't know why. All the usual parameters are very good. Are urchins and decorator crabs safe with other fish. I've had salt tanks for many years successfully until now.
Thanks for the mension fanatic, but ive only been at the saltwater hoby a few months myself and have a small tank but my advice for the op because he has had tanks for years would be to think if he has been doing/using anything different atall even simple things such as changing an adative/salts brand and if that's the case look deep into products, because I couldnt comment on the urchin or crab I know nothing of them in the slightest. Also think has anything like a nem or corals died ? Theres not a lot of info to work with.

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