Originally Posted by LasColinasCichlids
Red Clawed Crab?
Fidler, one claw is much larger than the other. They live to be about two years old and two inches wide.
"males have an oversized claw or cheliped; used in clashes of ritualised combat of courtship over a female and signal their intentions between conspecifics. The movement of the smaller claw from ground to mouth during feeding underlines the crabs' common name; it seems that animal plays the larger claw somewhat like a fiddle.
The crab's smaller claw picks up a chunk of sediment from the ground and brings it to the mouth, where its contents are sifted through.
Because they live in lower salinity water, pet stores may call them fresh-water crabs, but they cannot survive indefinitely in fresh water."
How about this one?