just like the question said, do you overfeed your fish? how do you stop this? Well, it seems that every time I walk by my tank, I always wanna feed my fish, kind of hard not to do so..
The biggest mistake you can make is to overfeed. There's no need for it - it challenges your filtration, it challenges your water change schedule, it challenges your fishes internal systems.
I feed my fish once a day and try to skip a feeding once a week. I'm probalby still over feeding them. Reason I think that is my largest Clown Loaches look like they swallowed a rock. They look like me with their swollen mid-sections.
I believe that everyone over-feeds their fish in one way or another.
I do over feed but i have too. My mid range fish gobble most of it up before it hits bottom so my cats dont get anything. so then i feed more to get food to the bottom. But i dont feed as much as i used to because i had one fish die of bloating. But i only feed once a day.