I'd imagine that your White's tree frog is feeling overwhelmed. As you have not had him for a long time and he came straight from a chain pet store - I don't think your frog has ever experienced a tank of his own as big as 33gal. After a couple of months of going from being in a crowded pet store, to handled and put in a small box to come home, taken in a small box transported home via car etc, put in a new tank, got used to that one, then put in his sick tank, then taken to the vet, treated, put back in small tank, then into this huge one.. that's a pretty extroadinary few months in the life of a frog. I can't even begin to imagine how on edge I'd be - I know I'm anthropomorphising, but in the study of animal behaviour ''stress'' is appropriate.
You said that when you first placed him in his old 'new' tank he took a couple of weeks to turn green.. I'd imagine it's just him acclimatising to his new surroundings.
If his tank has a predominantly brown look, if he's stressed his skin colour may be brown just to represent mood, but also I believe it's a survival camoflage. He's feeling vulnerable in this new habitat, it's practically a palace compared to anything he's experienced before as he has led a captive life.
Pick up some more hiding places, coco huts, bark you can put vertically and lean against the side, plenty of plants and just leave him be for a while. Don't put in moss, let him hunt himself and explore his surroundings more, he'll be more 'relaxed' in no time.





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