Yes, since Corid (mprollium) is not an antibiotic, it is safe to eat the eats while using it. You can treat for a total of seven days with Corid. Some also recommend with cecal coccidiosis, using it at a reduced strength (1/4 of the dose) for another 1-2 weeks afterward. Any local vet should be able to check a few droppings in a baggie, to see if there is still coccidia present in the stool. If the chick is alert, active, and eating normally, that should be a sign of improvement.