I’ve done DWC several times, not a newbie. Getting pH spikes from 6.0 to just under 7.0 in 48 hrs, and an algae like dark brown/reddish substance within 48hrs as well. New stones, black buckets, 950 GPH pump feeding 1 stone per bucket. Net pots covered with cardboard. What gives?
Solved
Roots. Color - Brown