Hi...if you brought breeding pairs, and the breeder only fed them FBW and live CBW then it should be just fine for you to do it. I would think fish fed that diet for that long would really be hard to get them to eat anything else....other than starving them for a bit. Though a diet with some type of plant/algae in it would be good in addition to the worms. My breeders usually will only get worms as well...is much cleaner to feed in a breeding tank. People feed ALL kinds of foods and diets on here....the bottom line is no one knows EXACTLY what a Discus diet should consist of. We just feed what we know to work. And if you have some healthy adult breeding sized Discus...fed only worms...then that diet worked for those fish and should continue to do so...Bill