I have 3 cresteds and prefer to feed mainly crickets, although I do also feed CGD I leave them in their cage taking them out will most often just stress them more especially younger ones. I feed my 3, 2 gatorade caps every 2 to three nights.
If I was you I would start with one cap leave it in for a couple nights you can always tell when they have ate it with feet and lick marks. you can leave it in for 1 or two nights after initially mixing it. Just make sure to check it for mold.
hth