My bd gets really dark in her tank and idk if im just being a paranoid owner but when she hides in my shirt she gets really bright and beautiful lookin with no stress marks but once in her tank they appear and she gets dark. I heard they do that to absorb more heat but in her tank she just looks so annoyed and angry. Her light are fine and her appetite is fine so idk what can it be is there anything I can use to bring out her colors more ? And I get the same effect with the baby I have, when he's in my shirt he's bright no stress marks but once in the tank he tends to darken up a abit ( not as bad as my juvenile bd) and his stress marks appear.