I feed once a week and I have 2 BPs that age give or take a month. My boy is now 550 grams and girl is almost 723g. They both are long and healthy. The girl being slightly more plump but no over weight. Neither have ever refused food. In fact they chase it down and pounce on it. Yes I feed pre killed, twitching still. They prefer the twitching or would to FT.