i'm getting an o. mercatoris. the only problem i have is the feeding. behind my house there is alot of fidler crabs running around so i sopose i could just use those. but they're so small i don't know how many to feed him or if he will even eat them. how many will he eat, (asuming that the fidlers are about the size of a dime)? will he eat them? and, if i let afew more fidlers than i should into the cage will he eat them all or save some and not eat them?