I recently introduced two 12 week old americana mixes to my existing flock of three Wyandotte’s. As a preventative I am using corid but the two new birds seem to have a little blood in the stool(?). It’s orangish red in color and is mucousy. I used the normal strength corid for 7 days, it seemed to clear up by the sixth day, then dropped the dosage to 25% of the original strength that I was planning on using for two more weeks in case It might be Coccidia but the appearance has come back in the stool. Any ideas? Should I go back up to normal strength corid for longer? Is it just the new birds getting used to the new environment and feed?