my advice as before get to the vet as soon as possible as I take it all your yb are infected or will be. I had had something similar a lot of years ago and it turned out to be worms. only difference no foaming at the beak.hope you get it sorted m8
silence speaks volumes b&d used to come on and try to defend themselves now they don't even bother ,maybe they will reply in two or three weeks time :emoticon-0138-thinking:
sorry, but if you want good pigeons you have to be patient, in the past any birds that where any good show up as young birds, not always, observation will tell you what to keep.its not only good young birds that make home from the yb nat.