problem.

he yall growing a bunch of different strains but two of my ladies are having what seems to be a magnesium deficiency but only at the top leaves. grown in promix hp, fed gh full line under hlg 550 v2. if not magnesium what else could it be

Hey Fellers, Been dealing with this problem for about a month/6 weeks now. Thought i had it beat then when i flipped into flower at the beginning of last week it came back with a vengence. my first thought was nitrogen, and second was potassium but apparently i was wrong. Grown in fox farm happy...

On my purple critical kush one leaf has almost burn marks of some sort and on my blueberry og two leaves have faint marks now also they about to be put into veg...whats happened...no nutrients have been given to them and they are under a 600 watt hps...?pics attached

I am a first time grower but jumped right into hydroponics as I have a tendency to try the coolest stuff first. I have two straight forward DWC system with two 5 gallon buckets with two air stones each. I add frozen water bottles in the morning and evening and have been monitoring the temp with...