But try warming up his/her cage a bit, and see if those colors dont POP alot brighter.. I have a SHTCTB that was bright YELLOW... almost a neon shade...and I let his temps stay at high 70's low 80's during the day.. he went very dull almost light brown the way yours looks.. I upped his heat to about 85 to 90 constant and he's back to that bright crazy yellow!
My female SHTB also had a brownish/ yellow colour when I first got here. Diddn't know why at first, but after a week with a good heath source, she turned to a really bright, yellow, colour.

But I've noticed that not every morph get's their colours back, with appropriate heath.:sad:
My Jungle Albino female for example; she was pink, orange and bright yellow when I got here. But after the cooling period, here colours were reduced to brown and yellow. And it's not changing back anymore!:roll:
I was wondering; Do you also have animals that diddn't change back to their most beautifull colouration??
Greetings,
Cindy