I recently got a Crowntail betta from walmart, I felt sorry for all the bettas kept in the small containers (as I'm sure with most of their betta sales).
In any event at time of purchase the lil guy's colors were faded out and upon putting him in a larger tank (14gal that is 1/3 full of nestle pure life [bottled water]) his colors darkened almost immediately and a fish that was a faded blue color became blue red purple and turquoise.
The concern I had is that he seems to be puking up size-able red chunks rangeing from a 1/8 inch greyish-red bit to a longer 1/6th inch blood red bit.
Other than that he seems active (even more active after throwing it up) swimming around the tank nicely and even eating some flake (that I didn't expect him to eat, but the kit came with it. I plan to run out for better food and perhaps some fish meds tomorrow depending on what I hear back and if he continues to throw up even more.
Thanks in Advance.