With the weight, check their body condition. They shouldn't feel bony. Here's a handy little chart.I don't feel weight loss but will weigh them today. They're certainly eating a drinking.
I haven't seen any bugs but am seeing little bits of red in the stool. It's a very small amount but tends to be more of a stringy red. What would that be?
I'm still a chicken newbie and feel like I'm sitting and waiting for another to die. Please help. Advice welcomed.
Stringy red bits in stool are usually intestinal lining as they do shed it. You can dump Peroxide on it and if it bubbles away, it's blood and if not, it's the intestinal lining or something else. Here's the ever-handy chicken poop chart.
The Corrid dosage is 2 tsp per gallon so you need 4 tsp for 2 gallons of water. Change it out every day and treat for 5 days at 2 tsp/gallon then reduce the amount to .5 tsp/gallon for 7 to 14 days.
I haven't dealt with worms in chickens so I don't know if you can treat for worms and cocci at the same time. My experience with worms in dogs/cats says that isn't a worm you're point at. But again, I have zero experience with worms in chickens. It's entirely possible your girls got into something they shouldn't have, like a moldy food scraps, and have something like botulism.