Corid and Sulmet are your only choices for cocci as far as I know, Corid being much easier on them. Tylan will have no effect on cocci, Salatin is correct. There is a home remedy that may help til you can get Corid.
Cocci is an organism that really likes warm, humid wet conditions. It's something that you really can't blame a breeder for. I know you're close to me, and so we have the same weather, which is a perfect breeding ground for cocci.
I would use the Corid, because it's more gentle on the system than Sulmet. I think you can buy it by the packet at TSC, and it's about $19.99.
Once you start using that, if you've caught it early enough, your birds will improve quickly.
I will have to run up there today. I am not positive yet that they have it. I just saw some questionable poop today in the coop so I am going to go take pictures and post. They are running around a lot, eating, pooping and what not but some of their droppings just looking a bit on the reddish side and one part of one had a pinkish red hue to it.
From the description you gave of your fowl/droppings they don't sound like they have cocci at all.
It actually sounds like you are seeing the sloughing off of the lining of the intestine: normal.