My adult american green treefrog always seems healthy and normal and active. But he is always some shade of brown or greenish/whitish/gray. What does this mean? He is literally NEVER green. Does this involve heat or moisture? I read that an active induvidual is lime green. What must I do to make him green? I really think green is much more attractive than his brownish color, and I worry about his health too.

(this started when I brought him home two months ago)