No, ozone has nothing to do with it, neither will humidity or temp

I've been using Neem oil throughout the grow (sparingly) and i've been religiously checking for bugs ever since i struggled to eventually get rid of all the fungus gnats (mosquito dunks did the trick) so i don't think its bugs. if it is nute burn do you know how to flush Miracle grow organic with the water activated time release nutes? Lights are 24" away and the top leaves aren't affected so i don't think its is light burn. Over watering possibly, I average every three days and i give usually 1/2 to 3/4 of a gallon to each of the plants in the 5 gal containers. Any advise on watering anyone? does this seem right?

bump, anybody? how can i correct the problem if it is nute burn with the mg soil?

bump bump bump

Anyone? I'm very worried about this

yes depending on your airflow the smaller plants should be showing ozone burn too.

and the fact that its only in the mg soil, is a pretty good indicator of fert issues.

theres no way its a deficiency this early in flowering unless your soil ph is way way off.

it doesnt look that bad right now, but if it shows up on more leaves,
a good ph corrected flush should fix the problem

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i don't think it is overwatering. signs of overwatering show up more as yelowing around the edges of your leafs, and some wilting.. i think you are having a nute problem.. that is the problem with mg.. the time released nutes are very hard to control.. and why they aren't recomended for growing ganja in.. if the problem persists, i would even think of re-potting them all together and using the same fox farms soil you used for the other plants as it is virtualy impossible to flush out time release nutes..
and just a word of caution with the fox farms... you can go two or maybe even three weeks without needing any farther nutes.. the ff is loaded with all kinds of good stuff, and adding additional nutes could cause farther damage to your babies.. and when you do start feeding them, start with about 1/4 of the recomended dose on the bottle and slowly bring them up to full strength.. sometimes too much of a good thing is no longer a good thing if you no what i mean.
best of luck, and aside from the spots, those babies look great

Once this grow is complete nether use a fertiliser based soil again, they cause problems i personally use soiless mix because you have more controll over your nutes, take advice from this guy he knows what hes on about!rep+ racerboy

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I no longer grow weed only research out of interest!

Thanks Guys! This really helps, and i will NEVER again use Miracle Gro soil..

Bump.. The smaller of the 2 kushberry has all of the leaves fading into a light greenish yellow (not burnt just "faded" loooking) please help