I treat as needed. Sometimes back to back for all summer if hot and humid.How often can you treat them? The 2 that I already had did a corid treatment maybe 3-4 weeks ago after a few of their siblings suddenly died. If I can't retreat those 2 so soon I'm gonna have to figure out where to set up another brooder to separate for a bit.
Lost over 2/3 first summer because I didn't know what it was and then waited to retreat. Doesn't seem to hurt them to get that much.
If you feed soaked or fermented feed, it needs to go in that water too