Jan 28, 2018 #21 Randy Holmes-Farley Verified Community Expert Reef Chemist View Badges Staff member Super Moderator Excellence Award Expert Contributor Article Contributor R2R Research My Tank Thread Joined Sep 5, 2014 Messages 72,100 Reaction score 69,741 Location Massachusetts, United States Rating - 0% 0 0 0 Barium? I wouldn’t obsess on it.
Jan 28, 2018 #22 Randy Holmes-Farley Verified Community Expert Reef Chemist View Badges Staff member Super Moderator Excellence Award Expert Contributor Article Contributor R2R Research My Tank Thread Joined Sep 5, 2014 Messages 72,100 Reaction score 69,741 Location Massachusetts, United States Rating - 0% 0 0 0 If you stopped dosing trace elements (did you?) that may be why molybdenum declined.