Burned Leaves

Hey

What do you say?
What could have caused this?
I'm feeding them the full range of bio bizz nutes: Grow, Bloom, Algamix, Top Max, Heaven.
Nine weeks after switch to 12/12 today.
The other girls have occasionally some leaf tips burned but nothing like this, and they get the same food.



Thanks,
David

I use the same nutes and never saw that type of yellowing even at full strength on all...with that happening to the upper leaves.....perhaps heat? Poor air circulation...

I think it's less likely heat or air because she sits right beside 4 other girls and they all are fine.. hmm...

Looks like its gettin a little to much nutes, each strain will differ from the rest. I noticed on my current grow that one of mine i have to go 1/2 strength otherwise i get nute burn. I would flush it, then start fresh with 1/2 the strength your giving now.

What size light do you have ? how close is the light ? are you growing all the same strain ?