Which Growing Medium would be the best to use?

A customer has a question and I hope we can get some opinions on it, thanks.

“I was wondering if you had any advice on daisy chaining dwc buckets and which growing medium would be the best to use? I tried clay balls but it turned my roots brown”

Pro mix is what I would recommend with flower power nutrients

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clay balls don’t turn roots brown…algae and root rot from contamination, not enough air, high water temperatures and or light infiltration are the usual culprits for brown roots… sometimes nutrients can darken or stain roots.