I think giving calmag was the right thing to do in this case. mg deficiency shows as small, golden-yellow spotting in between the leaf veins, and that looks exactly like what you've got there. If giving calmag was a shot in the dark, I think you hit the target. It shouldn't take more than a couple days for the spotting to stop or disappear.
polishpollack Reviewed by polishpollack on . Colored spots on leafs Well its has been a while since I've been on here. Been cleaning the basement to start my Soil, Hydro and LED threads. But yea, Well here it is I've notice spots on my leafs, It has to be my fault as usual, but I have to know what is making them that way. I'm assuming calcium def. and was wondering what can cure that? well here is is. What is your experience level? (first timer, novice, experienced...) Novice Your Equipment: .1) Type and wattage of lights. 400watt hps .2) Distance from Rating: 5