Hi everyone, just a quick update for future reference.
I had one bird with green slimy poops and one with bloody poops.
I drenched both birds with Safeguard (.23 mL per pound) and Corid (0.1 mL per pound) for five days. Poop returned to normal around day 4. I had seen it recommended to re-administer after 5 days, and I did that yesterday. This morning, I got bad poops from them again, so I'm glad I saw the re-administration recommended! I was planning to do just one re-admin, but I'll do another full 5-day course, and maybe another booster 5 days after that.
Thanks so much, everyone (especially Kathy!) for your advice and support. You can be sure I'll pay it forward as I gain wisdom in the world of chickens.