My betta is usually very active, he swims up and down his tank, but today all he has beed doing is staying down at the bottom of the tank. Should I be worried? Could he be sick or is it normal for a betta to do this. Besides the bottom sitting he looks perfectly normal. I just tested my water and got 0 ammonia, 0 Nitrite, and I can't tell if I have 10 or 20 nitrate. The water seems to be good, I did a 2 gal water change yesterday. Besides that nothing has changed, I feed him Hikari betta bio-gold once everyday (sometimes twice) and I always soak his food for about 5 min. before feeding him.
Thanks for the help.