Most run a 3 day w/female - 3 day rest schedule. Offer food during one of his off days (I'd go with the first or second day to let him have a day or two to digest if he eats). Otherwise, monitor his weight and if you notice him losing a substantial amount, pull him from breeding. I've heard of people breeding as small as 250 gram males. I don't think I would breed at that size but I also won't criticize those who would. If yours is producing plugs and you want to give him a try, go for it.