Ok, I don't know if they would fit, probably not, but anyone ever think about "Christmas Crabs"? http://en.wikipedia.org/wiki/Christmas_Island_red_crab
When I used to run A fish aquatic store my numnut assistant manager ordered them. They were very cool. I did put them in a 30G after some research. But I don't know if one can live in a ten gallon. Anyone have experience?
Rusty