Decorator crab

probably wouldn't be too bad, they're very small and only clip little pieces off. But, they're so small you might not see them very often. I've got at least 3 in my tank as hitchhikers and I've only seen them once in 6 months
 
They wont do much damage at all if any. Most of them are covered in sponges already. If it clips off a few zoo's it will be ok. They'll grow back anyway. I doubt it will go after your brain.
 
I've got one in my 29 gallon and he is great. He comes out all the time but he has only one polyp on him which is kind of a let down but he is very cool.
 
decorator crabs can get pretty large and will start hunting down smaller crabs etc. I had one that was the size of a softball that took out several small fish, and all my crabs and snails.
 
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