I have clowns (only 2) and they are a pretty little frogs. The first time I was shipped the frogs one died on arrival, and it was a fairly young, small frog. They sent me a replacement (and I happened to order one more as well) and they shipped me adult frogs. Personally I don't think clowns should be shipped young because they are such a temperamental frog. They stress out way too easily and die because of it. My adult frogs eat fruit flies, the Hydae, and young crickets (mostly fruit flies). The other thing is a ten gallon is really not that great for clowns...even vertically it doesn't seem like it will be tall enough...while my frogs use the while tank, they mostly stay in the top of the tank. An then to put 5 of them in there, to me, is way too crowded. So that could be stressing them and causing them not to eat.