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Do not use both at the same time.

Start with whatever you can get first. Corid is usually in the cattle section, FYI.

Yes, it can be many things, but coccidiosis is probably the most common cause of blood in poop. Sulmet only works on two, maybe three (can't remember) of the more common types of coccidia that chickens get, so you should look into getting some Corid (amprolium ).