About a day ago my betta became much less active than usual, even to the point of not being interested in food (she ate one Hikari pellet earlier today, but when i dropped another one right in front of her face, she didn't even care). Usually, like most bettas, she is a shameless beggar about food. Now, she mostly just floats or sits utterly motionless in different parts of her tank, and shows no other symptoms. Water temp is her normal 79 F. I don't have any water stats but she's on her usual water changing schedule, which has never seemed to bother her before. Can anyone tell me what might be wrong/what to do? Thanks so much.