I'm feeding my 1400 gram girl a 100+ gram rat (F/T) once a week and she's still ready to bite my face off. She's got the best temperament but she's always hungry. Once she hit 1000 grams, I bumped her up to mediums (100-130 grams) and she's been gaining weight like crazy. When I got her in April she was 925 grams and she's now at 1413 not empty. 500 grams in 4 months is pretty good.