1. Of course sometimes they'll give you a heart attack because they'll look dead lying on their sides on the tank bottom.
2. I don't know about everyone else but I don't feed on any given schedule. Alot of people use automatic feeders so they don't have to worry about feeding more than once or twice a day.
3. I recomend rotating the lights so they're on for an hour, off for half an our, for around 10 hours on my low tech tanks.
4. In my expirence they seem to. They always come up to the front of the tank when I walk up but not when anyone else does.
5. I don't keep mine where noise is an issue but i'm thinking the vibrations might.
6. You need water movement. As long as the discus aren't fighting the current you should be okay.