I have a shelf under my 90 gallon that fits a 10 gallon tank. I am setting it up for my young grandchildren as a "critter tank". Going to put in a few snails, hermits and a crab. Dont want to put any fish so the CUC has nothing to CU! LOL Anyone have a tank like this and if so how do you feed it? I was thinking of dropping in a piece of krill, clam on the half shell etc, anything that will sink and take it out when the crab and hermits are done with it. Sound like a good idea? Any suggestions would be appreciated.