My betta has been mostly hanging out at the bottom of the tank as of late, occasionally coming up and swimming around as per usual (he was very active when I first got him) He does get really excited when I come near the tank and swims around in front of me until I leave, but when I do leave he goes back to hiding or sitting at the bottom. Recently I've also noticed his scales changing color below and around his head (turning white) AND NOW some of his scales are turning kinda orangish? I've only noticed one or two spots. What can I do? I'm pretty knew to fish keeping in general. But I know something isn't right here.