pale comb is consistent with worms or other parasites, as it can be a sign of anemia.
And there are no respiratory symptoms like sneezing, wheezing, discharge at the eyes or nostrils, right?
I have always wondered about feeding the eggs back to the hens, but seems like it's standard practice, i think it makes sense though that there could be residual in them. I rotate my wormers.
Up to you to pick one.
if you have a local livestock place, that's perfect, else you might have to order one online. Jeffer's pets has a bunch. Safe guard is another good broad spectrum one, btw. After you pick one, come back here and check the right dose.
The one you probably do not want to...
you can just get one of them. You need to worm them approx every 6 months if they free range all the time, and once a year if they are more confined. With valabazen you need to discard the eggs for 2 weeks (feed them back to the girls). With eprinex, i usually only discard them one day (no milk...
to be completely sure, you take a poop over to the vet and have it checked for parasites, then you know exactly what to treat for. If they can roam outside, and never been wormed, they definitely have worms. Even if this could be something else all together.
Valbazen is a good wormer that...