hi again i have brought a plant off someone and it looks sweet it was about 13inch high and its been under the 400w led for 3 days and is growing good BUT,there are brown spots that have appeared on 4 leaves so i went to get some cal-mag but was told you can only use it when there in flower and just take them leaves off,If i use it now do i still give them CoCo A+B at the same time.
thanks