I purchased a YWG from petco about a month ago and he's been in QT ever since. I put him in my DT last weekend and he is not at all yellow. He is a gray/white color with a black head but still has his blue spots. Are there ywg this color or is it possibly because he was in QT with no light or substrate? When I bought him he was a faded yellow. He's only about an inch long. Any ideas?