Yes, I would treat all with the sulfa to be sure the intestinal bacteria won't remain and cause corrosion of the intestines in any more chicks.
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Thank you for summarizing all the awesome info for me!To reduce the information our team of heavy hitters have supplied, so you understand in a nutshell what is likely occurring, the coccidia have managed to assist bacteria in eating away at the intestinal lining of your chicks, causing the continued bleeding.
Therefore, you now need to treat for a bacterial infection on top of the coccidiosis using an antibiotic. Sulfa drugs are the most recommended to treat the condition called necrotic enteritis when occurring with coccidiosis, but if you can't get them, you can certainly try any broad spectrum antibiotic.
Without it, you're certain to start losing chicks.