Apr 27, 2019 #1 jeffchapok Valuable Member View Badges Joined Dec 31, 2018 Messages 1,232 Reaction score 1,694 Rating - 0% 0 0 0 Brown snotty stuff, mats over my substrate. Diminishes without white light.
Apr 27, 2019 #2 Ranjib 7500 Club Member View Badges Reef Squad Excellence Award Expert Contributor SF Bay Reefer My Tank Thread Joined Apr 16, 2016 Messages 9,848 Reaction score 17,081 Location Pleasant Hill, Concord Rating - 0% 0 0 0 not sure if its algae or bacteria. lets see what other say,