This is my newest betta, "Sky" and when I got him, just yesterday, his white was pure white. I noticed last night a slight pinkish streak in his tail and tonight there is more. Is it really possible for them to change this quick? "Sky" is because he's the color of the sky which I love and now I'm wondering if he's going to change dramatically. Also putting in a new picture of Finnigin which I've had since Jan 7th. and he's certainly changed. "Sky" was checking out his new betta log. For all of you that gave me advice on so much I wanted to let you know there are now no filters, they all have heaters and they are eating the new food, the NLS pellets! Thank you for all your help.