Are your rabbits babies? When they are young you can feed unlimited pellets, and then as they get older they only need a small amount, about an egg cup full each per day, I give mine a handful each per day. They need to be eating lots of hay, if you overfeed pellets then they probably won't eat enough hay. They should each eat a pile at least the size of themselves every day, basically unlimited. If they don't eat enough hay then they will be likely to be dental problems, which are very costly