Got a couple of hammers showing signs of something. No changes that can be noted alk- 8.5-9 ca- 420s mg 1350+ no3- 4-8 po4 0.04-0.08 Started w one and spread and is confined to a certain area, from the pictures you can see what I’m talking about. These spots appeared over a couple of days. Was thinking probably low nutrients (uptake is high) w a combination of light issue. Wanted some expert opinions before I took corrective action. Tank is mixed reef, jam packed w euphyllia. I dose on the daily for nutrients and keep up w major and trace. You can see they’re healthy but not too sure of these spots. My Coral guy, RJ, said nothing to worry about but a second opinion wouldn’t be a bad idea, TIA!!