Great, thanks guys! I guess I don't really mind as long as it won't hurt my betta. Kind of interesting, really.
That's weird that it's probably from overfeeding. I've only been giving him about 3 hikari pellets per day lately, sometimes less, because I have 9+ hours of class so it's been hard for me to find the time for betta maintenance, goldfish maintenance, two dogs, AND homework. Yeesh.
But my water must be all kinds of out of whack because my Betta's fin TOTALLY shredded literally overnight. Like at 1 ish in the morning is was fine and when I woke up at 8 it was all shredded. Well... not ALL shredded, but you know, not perfect like before. I don't think it's from tail biting, either.
I haven't been gravel vaccuuming as much lately, though. Mostly just charging water. And I have a huge algae outbreak on the gravel and equipment, but i keep it pretty well scrapped off the glass.