My White’s tree frog is sick and I don’t know how to help him. Yesterday I noticed that he looked unusually thin and when I picked him up he didn’t try jumping or moving away from me. I placed him in some water and noticed that he had some mossy looking stuff on him that was floating in the water. I got that off of him and placed him back in some clean water. I then placed him in a smaller container with some small crickets. He would make an attempt to get one but wasn’t able to. I got some appetite stimulator from the pet store but he is still weak and thin and now his skin is green & brown and splotchy. Any ideas about what is wrong with him?