Are you talking about a Zilla Critter Cage by any chance? That's what I have (20 gallon long with sliding screen top with two tabs in the back that it locks into and a place for a lock in the front). The general consensus I've read on here so far is that although nothing is escape-proof, these cages are pretty good. That being said, I don't have hatchlings, I have juvies. Maybe you could cover the hole with some hot glue or something to be extra safe?