Can't figure this out!

[chicksneedhelp]

I have 6 hens and 2 roosters in 3 different coops. In one are 3 hens and a roo, and no one has been laying for months. They are +2 1/2 years old, active, eating and drinking well. Two RR hens have pinkish combs that fall over (one paler than the other and looking raggedy with white feathers peeking through the brown), and the silver laced Wyandot's comb. Is pink. The roo has a healthy red comb. There's been a lot of diarrhea in this coop, but I couldn't see worms, so added vinegar to their water with no appreciable change. Took stool sample to Vet, who is not a chicken expert. He found capillary worms in stool, so got Wazine 17 and put it in their water for 48 hours. Still had one diarrhea deposit, and 10 days later, maybe another. It will be time to redose in three days, but I'm thinking there's more to this. I would have expected no diarrhea by now.

In another coop are 2 hens 3 1/2 years old, who haven't been laying for several months. One has a pasty bottom. Gave her a spa treatment, but she had a dirty bottom again a few days later. I treated these girls with Wazine 17 also, although they have normal poop.

All chickens have gone through molt and are getting new feathers in, so I wasn't expecting eggs - but the diarrhea and poopy bottom have me worrying. Would appreciate advice!

 

[SilkiesForEver]

I'm no expert, but my first thought goes to their feed. What are they eating? Do they get to free range?

 

[chicksneedhelp]

They have been getting Feather Fixer, then mixed with Purina feed with Omega 3 to transition them back to the Omega 3 feed. They get some Romaine lettuce in the morning and a cherry tomato or two in the afternoon for treats, plus occasional other treats like scratch.

They have their own small covered yard to protect them from predators. Haven't let them out to free range since the diarrhea started since I didn't want to spread anything to the others. Today probably 3 of them had diarrhea again.

I wormed the chickens in all three coops, although the others didn't have diarrhea. Now I'm wondering if I need to do the repeat worming for those in the other coops, since their poo looks normal. Only the icky bottom on one hen...or do I need to repeat the worming for them all?