My whites tree frog seems sick, He hasnt been normal the past few days, he had turned a darker color than he normaly is a few days ago, but I didnt think anything of it because he durns dark every once and a while, but turns back bright green again, well he has been dark for about three days now, and he is now more purple than brown and he isnt moving very much and doesnt appear to be eating. I have him in a 20gallon high tank with a big plant branches to climb on and places to hide, and a 3inch by 3 inch water dish, he has a good habitat and has been doing well in it since the end of the summer, someone please help.

