I feed my adults once a week, as much as they want. Since I started using the trout/gelatin mixture, I've noticed a real difference in activity level, and growth. Deejay's shed twice already, and is noticeably thicker.
I feed the babies twice a week, and they're growing like weeds. Inchworm is over a foot long, and Checkers is rapidly catching up.
I throw nightcrawlers in with all of them as a treat.
They all have slightly varying eating habits, so you kind of learn as you go how much and how often to feed.