For everyone who has pale, unstable dats like I did before, you might want to try what I did. I had my dats in a 60g and then moved them to a 210g barebottom tank. They were really unstable though and were pale colored for about 3 months. Last month, I added about 40 lbs of 3m black colorquartz sand and most of them colored up nicely. Before, I couldn't even see their stripes, but now their stripes are much darker and their base color went from a light brown to a a darker brown. I like them a lot more now. I guess it makes sense -- dats want to blend in with their environment so their colors will change if the color around them changes. Try it out. It might make your dats color up.
Here are some before and after pics.
Before adding black sand:
[YT]H4kOfKZdVmE[/YT]
After adding black sand:
Here are some before and after pics.
Before adding black sand:
[YT]H4kOfKZdVmE[/YT]
After adding black sand:

