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Your doing the right things to fix the issue, just figure out what strength the calmag should be at and you'll be fine. Next time mix in dolomite lime with your soil and you won't need to buy the calmag which cost more.

Looks like it was stressed prior to flowering or you got some mutants on your hands.

Looks like the pesticides hurt them by stunting old growth. I think your overwatering and it's compounding to the old pesticide damage. Lay off watering too frequently and everything should be fine.

Sorry to resurrect this thread but it makes me laugh when i read it. Calcium nitrate and magnesium sulfate precipitate when mixed unless chelated. Don't waste your time trying to make your own cal-mag with the mix listed.

I hope your not saying my advice was bad, because i truly wanted to help you out. You should reveg the plant if you want to take a clone of it. Switch it back to 18/6 and give it a light feeding. Leave foliage and a few smaller pieces of herb on the plant so it won't die. That will be a safer...

I still think its calcium, you can make a foliage spray of Epsom salt to test if its mg deficiency.

Temps too cold.

The leaves that were damaged will try and fix themselves as much as they can. I would just veg a little longer until you notice the tips start growing correctly than flip.

I hope you the best buddy. :-P

I would say overwatered also, it also looks like you need less fertilizer and some calcium to balance it out since your getting the rust spots.

It is sad looking but I really think it's an overwatering issue. I think you should mix the perlite with the soil the next time. If you wanted more air to get in the pot than buy one of those pots with a bunch of holes on the side, it'll work better than adding perlite at the bottom. By doing...

Raise up the lights, also are you using any of that hydrogen peroxide you have right there? I wouldn't use that cuz high doses of that could do that also.

It'll speed up growth and stop the problems your explaining.

You should use 5ml a gallon.

Nice grow playtowin, update with pics when you get the chance.

Pretty odd symptom, may I ask if it's cold over where your at?

Looks like light burn and humidity issues. How about a picture of the whole setup so we can further help you?

If you post a picture than people can give you more solid advice. It could be from N, P, K, Mg, or genetics.

1-3 leaves could be from genetics if it's a sativa or hybrid cross. Other than that it could be from stress that will go away with some veg time.

Calcium deficiency, get some dolomite lime at Home Depot and sprinkle a thin layer to just cover soil and water it in. You'll see no more rust spots appearing but the old ones won't fix themselves either. Don't add anymore fertilizer except for the dolomite lime.