I recently bought a crested gecko from a local pet store (bad idea I know) but hes really healthy. At the store they did not have any repashy or any other supplement, only food was crickets. How hard is it to switch a crested from crickets to repashy? I feel like he would not know that he's supposed to eat the powder. Also I've looked at various pet stores and none of them carried repashy. Where can I get some? Thanks ahead of time!