Medicated feed will not prevent a respiratory infection.
It may, and only sometimes, prevent Coccidiosis.
You need to purchase some poultry grit asap...especially since they are not eating JUST a chick starter.
By having all that fresh green material in the brooder they are probably eating it...
Congrats on the new chicks.
I have not read back and caught up yet...looks like you need to get them into a coop already...box is looking quite small.
Keep an eye out for real bloody poop aka Coccidiosis.
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