Pinkies and worms provide enough nutrition/variation. Plenty of people feed a worm or pinkie-based diet with no problems (though they do love fish). Also, if you're feeding prey that has bones like silversides or pinkies you don't need to worry about a calcium supplement.
I like to feed younger ones smallish meals two or three times a week as opposed to a single weekly feeding. My really old one seems to keep his weight up better when his weekly food is split up over a couple days as well. My year old female probably eats 1.5 pinkies and a worm or silverside each week, but not all at once.