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do you have any pics?

are they just starting to bloom?

Def NOT a magnesium issue

Nitrogen burn....flush ASAP

Technical Information: Nitrogen regulates the cannabis plant's ability to make proteins essential for new protoplasm in the cells. Electrically charged nitrogen allows the plant to tie proteins, hormones, chlorophyll, vitamins, and enzymes together. Nitrogen is essential for the production...

I'd say a ph issue too, I know someones gonna talk shit but nitrogen defs can cause leaves to turn purple in some cases

I'm kinda against botanicare calmag, not their whole food line... Had problems with a magnesium def and their calmag didn't help one bit, but that's in soil and I would imagine that it probably works better in hydroponics. I have NO connection with general hydroponics but their general organics...

ummmm thats a great question, Ill leave that to a hydro person.. But since your using RO water your gonna wanna supplement with some calmag also or you'll run into problems during flowering..

My cousin uses it and hasn't run into any problems with it yet. Just make sure you add some extra dolomite lime to it.

and if you can get them fed with it soon then they will resume growth and you still could get a decent yield outta them

I tried every calmag on the market and by far IMO general organics works the best.. I had an issue with one of my favorite strains when I switched to promix and tried everything under the sun to fix it. I had ruled out calmag issues, couldn't figure out what and the hell was causing it. Then in...

the 3rd pic sorta resembles a copper def but havent delt with it much

more info... food, frequency, water, additives, strain, all the good shit

ph may be outta whack

Your def has set in pretty good by time the plant show signs of it, get some calmag and supplement with every watering. On your next grow start using it right when you flip your light to flowering

or a complete magnesium lockout

That is a magnesium def

Doesn't look like anything you should worry about, not every leaf is gonna be perfect.. Can you take a pic of the whole plant?

Home depot now carries promix and at a decent price

When in doubt, get em a good flush and re-feed