Crickets are very very hard to breed on a small scale. They smell very, very bad too, require daily cleaning, and are very sensitive to temperature changes. Too warm, they die, too cold, they don't breed.
I'd seriously consider starting a mealworm colony. They are relatively easy and safe to maintain and they are a great food source for your leos.
Being a fish board, won't a lot of cichlids or catfish eat them as well?