Does they need any kind of special food, or will they scavenge enough to get fed on their own? I bought some crab pellets that said hermit crabs/fiddler crabs and put a couple pellets in there, but I'm just curious if they needs those or not. I have one small blue/yellow damsel, one little fiddler crab, a tiny horseshoe crab, and a just a regular little hermit crab at the moment. The horseshoe crab has buried himself under the sand (I've got about 2 and 1/4 inches of sand), the hermit crab is on top of my live rock formation, and my fiddler has hidden in a tiny cave under a piece of rock. 10 gal tank. Thanks for any advice!