I've only had my bearded dragon for a couple of days but I notice he hasn't eaten any of the salad stuff. He goes to town on the crickets but I'm worried that he wont get what he needs. I bought him at petsmart where I was told that they were feeding him mealworms and lettuce. Should I try lettuce to see if he eats it then switch to collards slowly? Or, should I try to hand feed him the collards? Please advise.