I have a Fluval 206 in a 29 gal heavily planted tank. I've noticed that the fish food gets swirled around by the output of the filter when I feed the guys (gals). They end up chasing the food around the top of the tank. Some of it gets to sink. The inhabitants seem to chase down the food on the bottom. I don't see any food on the gravel.
The ammonia is at 0 and has been for months, same for nitrites, nitrates >10<20, pH is 7.6 since the tank was started. Tap water same O, same O. I do about a 20% w/c every week.
Please excuse me if this is a stupid, read silly, question because I've still got a lot to learn.