Update on Zeplin. Few questions..

He seems to be warmed up to his tank very well. He's been pooping and eating every day since I got him. He eats about 20 baby dubias every night. They sit in his glass dish with calcium w/ D3. Is that enough food? Is it too much? Also I put the moss stuff in his middle cave and he won't go in there anymore. I spray it a lot but it seems to dry out very quickly. What if he never goes in? He might be going in when I'm not checking, but who knows. I want to be prepared for when his first shed comes. Thanks!!