I have to agree with Orin... I feed mine fish food also...also throw apples, carrots, etc. in there. I have had success with a small amount of bananna baby food... I might try putting some rotten wood logs in the cage for the egg cases to be laid on... the majority of my egg cases have been laid onto the bedding...one was glued to the eggcrate... I think they would REALLY benefit from a rotten wood log to lay there egg cases on...
Good luck...these are one of my favorite species...
Graham