I read in many posts that some MFKeepers's lose patience with Dats, if they hide, go dark, or lay on the side. Well, stick with it and do all the stuff, others have posted or advised in the forums, and wait it out. Trust me.
My first tiger, I had from 1 inch. Between growing 2 to 9 inches, in 4 years, he was so dark and unstable. But literally, during a 4 week period about 6 months ago, he gradually changed into this :

My first tiger, I had from 1 inch. Between growing 2 to 9 inches, in 4 years, he was so dark and unstable. But literally, during a 4 week period about 6 months ago, he gradually changed into this :