My Three Chicks
Crowing
I got 3 chicks from the local co-op Fri 
They are from Hoovers and are vaccinated for Mareks. But NOT for Coccidia.
They are on a non-medicated starter feed (Scratch & Peck).
I was recommended by them to give them Amprolium as a preventative for Coccidia.
Should I? I want to give them the best chance at not catching Coccidiosis in the future.
If so, what's the dosage? How long and often?

They are from Hoovers and are vaccinated for Mareks. But NOT for Coccidia.
They are on a non-medicated starter feed (Scratch & Peck).
I was recommended by them to give them Amprolium as a preventative for Coccidia.
Should I? I want to give them the best chance at not catching Coccidiosis in the future.
If so, what's the dosage? How long and often?