We'd need a bit more tank backround. Mostly the size of the tank as that's a huge factor for compatibility (for example and emerald crab and sexy shrimp would not mix well in a 2 gallon.. but in a larger setup like a 75 there is plenty of room for the two to ignore each other and coexist)
Spider crab (decorater?) is very oppertunistic.. when underfed it will attack the easiest availible target. Cleaner shrimp would mix well with this crab due to their size and activity but should it get sick the crab may go after it.
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