Yeah; those breeding traps are only for n00bs who think they must save every single fry that's born! I don't know of one single 'professional' fish breeder who would use one!I have attempted to raise fry in a breeding tank floating in main tank twice with a small success. the difference when you raise the fry in a separate tank on their own is amazing!! mine are thriving!
Edit; of course, now someone's going to come on here and say, "oh, but I know the person who bred 'The World's Greatest Ever Guppy' and they swear by breeding traps", but that's just fishkeeping for you! I wonder if other hobbies have as much difference of opinion as fishkeeping (apart from Doctor Who fandom, I know that does, lol)?