Leaf curl and gowing brown

Hi,

I'm in flowering at the moment and buds are growing well, only issue is the leaves are curling under and going crisp and brown. they are under 2 x 200 CFL's with 2 grow light strip lights 48w each front and back of the grow tent. Temps are 26 to 29c and i'm growing in coco with perlite. watering until water comes out of the bottom of the pot 3 times a week, coco is damp but not wet.

See pic


Any help would be good

Thanks

Side note, I did trim some of the ends off thinking that would help.

What do you feed them, how often, and how much each feeding?

too much Nitrogen...and/or Low Ph....

Jus Naturale said:

What do you feed them, how often, and how much each feeding?

Click to expand...

With Canna Coco A+B with every water 3.5ml per litre

watering ph is 5.8, not testing the soil before.

Should I flush with water without nutrients in and if so what ph should I use?

Thanks

Any ideas anyone

Your Ph is too low... shoot for 6.5Ph feeding/watering...

i give mine between 6.8 and 7 and the runoff is usually 6.5 looks almost like nute burn

yeah... the Ph range for cannabis to absorb the correct nutrients is 6.3 - 6.8
Since soil is a good buffer, sometimes you can water up with Ph up to 7. (which I do when I feed heavily)
just put some PhUP in your nutrient solution before you feed next time.. (and every time)... low Ph can cause burn and lockout...
a good flush may help if they dont seem to recover in a day or two.

Just washed them through with water 6.2ph until water run clear, plan to give them a couple of days and fingers crossed.

It sort of looks like light bleaching. How close are your lamps? Maybe you might consider backing off the lights a bit. Peace