Have you covered 3 sides of the enclosure so he cant see out from every direction, If not this helps them settle in faster. How big is the frog? If the frog is a juvenile and you got him from Petco this means he has been there for a little while and Petco doesn't keep the best care of there frogs, he could possibly be sick with something. I don't think they dust there feeders they just rely on the gutloading to be enough for the vitamins they need in which it isn't, the feeders still need to be dusted and if he doesn't get the proper vitamins this could lead to problems like MBD. Can you post a picture of the frog, or a couple pictures. For the moving, these frogs aren't very active at all. They pretty much sit in one place for weeks on end sometimes or they get a favourite spot and just keep going back there, they aren't very active and sometimes with them being so lazy its hard to tell if there is something wrong with them. Try the worm and let me know how it goes, sometimes when they reach a certain size crickets aren't enough to stimulate there feeding response and you need a bigger feeder. All my guys and gals are adults now and only one of them will eat crickets, the rest of them couldn't be bothered.