Just need to diagnose this problem on my little orange seedling here… Their names are Orange and Blue from zip ties but both same strain.
Water pH is 5.7, ppm is 300. I fed 2ml of micro, grow, bloom and 1mL CaliMag per gallon. Roots began touching the water two days ago, I was hand watering before and so I am thinking it’s problems with the nutes as the spots weren’t there before. We’re doing a full res change tonight and taking ppm down to 200-250 to see if that helps.