Yes, that is the heater, it's also one of the lower flow areas in the tank I think. I've got a sponge filter in the same end as the heater, and an Aquaclear 20 on the opposite end.
He moves out of the corner to feed, but he's only eaten a handful of times. I attempt to feed 3x a day. Morning, late afternoon and evening, same as I feed my other fish.
He definitely still looks healthy, no different than at my lfs, my camera doesn't like to focus on the tank, water is too clear, wants to focus on the background.
His pattern so far that I have observed is early morning, I find him in the exact opposite corner, swimming towards the same end of the tank. Shortly after lights on, he's back to the corner with the heater and stays there until lights off. So maybe he's just 'hosting' that particular corner of the tank.
He is currently alone in the tank. I wanted to buy a smaller BTA, but don't have the lighting for it in QT. Are Clownfish social fish? That hasn't come up in my reading either way. If so I could probably go find him a friend this weekend, lfs has a few sub 2" yellow tangs I've contemplated getting.