First Tank

Expect a long wait. I've had my crabs for a bout 3-6 months now and haven't seen any noticable growth, however, I don't pay much attention to them.

There's LOTS of crabs that don't reguire shells, however, within my knowledge very few of them stay small and many will happily eat your fish if they aren't fed enough to keep there bellys full.
 
Crabs such as sally lightfoots, emeralds, or porcelain crabs might be a good fit. They are effective cleaners, but if your tank is newly set up, be prepared to supplement their diet because there likely would not be enough algae growth.
 
the porcelain crabs are filter feeders and will harvest detritus and algae off of your rocks. Sally light foots are escape artist, emeralds are good and arrow crabs can be good but, they have some attitude issues from time to time I would encourage you to research them a little f.f.
 
No, that would really be pushing it bioload wise and I'm not sure a 10-15g is really big enough for this species. Would you by any chance like some different ideas for what to keep in the tank?
 
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