He's in a glass viv that has mesh on the top. I'm feeding him on the komodo crested gecko complete powder, baby food and banana every so often. He wont eat insects, i tried him on a tiny grass hopper and he just licked it LOL, awww!
Banana should only be a very very occasional thing as it has too high a potasium content for cresties. In all honesty I'd leave it out altogether.
Mango, Papaya, Melon, Pear and Peach are better alternatives.