have you gotten him into the bigger tank yet? cuz if not then i would say try to keep up on the water changes the best you can, you'd be surprised how quickly your water quality can go down the crapper if you forget to many water changes in a small tank.
although now that you're on top of things it probably wouldn't be disastorus if you do miss one here or there.
and as far as feeding only feed what he can eat in 20 sec, if he eats his fill in that time ok, but you want to limit the food because the less that goes in the less that comes out and the less that comes out the less ammonia and the better the water quality as long as you don't starve them.


