Is there a decimal point between 25 and 50? I hope so! If not, I hope you hit the Florida lottery.
Coccidia will always show up on a microscopic slide no matter what. It's the count on the slide that matters. If the microscopic slide only shows a few coccidia, that is normal and everything should be fine. However if the slide is loaded with coccidia, then there's a problem and treatment will be needed. Ask them if the slide was full of coccidia or just a few that were seen.
Corid is a thiamine blocker and not an antibiotic. It should be safe to give your bird. There shouldnt be any contraindications with other meds.