I was just thinking the same thing . Following this one.
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I agree about shouldn't be a problem...had to ask before i end up getting one to find out a bad mistake, ya know...doing homework first.I tried it... Can't find the crab. I don't know if it's alive and shy or dead.
I don't see a reason it would be a problem... Micros don't seem aggressive, and I'd think they'd eat shrimp food.
My LFS has them in the same sale tank, but I know that doesn't prove much.