Strange curving of leaves and signs of burning help please

[MrMackey]

Hi folks I’m hoping someone can help me out with a problem I’ve had since switching over to coco. I’ve been following cultivators guide to coco word for word had my 1st crop come down and it done well I was pleased with the outcome for sure but had these weird curves in the leaves it started on a few branches and ended up on most.

I’m using 600w hps lights around 18”-2ft above the canopy temps are 26/28 day 17/20 at night I have great ventilation with fans and filters and as I’ve said I follow cults guide for feed on coco keeping the ph between 5.8-6.2 however the tank does have some mad random fluctuations some days I’ve set it and next day been low as 4.8 or high as 6.8 but mostly it’s kept right.

It looks as if it’s nute burn so I flushed with a weak feed of 1.2 ec for 2days the 1st run around week 6 when these signs showed and it didn’t fix it in fact it got worse. I’m now on the 2nd run on week 7 and it appears to be happening again I’ve had my fair share of problems before but really stumped on this one!
If anyone can help a brother out it’s much appreciated

 

[Chris Scorpio]

I see a little tip burn but hard to see with the HPS on

Try pics with it off my friend

 

[MrMackey]

I see a little tip burn but hard to see with the HPS on

Try pics with it off my friend

Yh sorry there bad pics will get some lights off tomorrow forgot to add this is the early signs of it it’s the small leaves round the bud almost hook shape with burn marks round the curve :S

 

[MrMackey]

Few lights off pics can see it much clearer although it’s only early stages compared to last run

 

[Huktonponics]

I had this same thing happen when i added Mammoth P to my feeding schedule at the " uncorrected dosage " ( which was hot )that was changed shortly after. But shortly after i stopped using it and it stopped.

Its the only time ive seen such a deformity.

 

[3fingerdSean]

I know that coco is notorious for having low micro nutrients. That was my first thought. Are you giving them a strong micro?

 

[MrMackey]

I know that coco is notorious for having low micro nutrients. That was my first thought. Are you giving them a strong micro?

It’s cannaplus coco and it’s fed on ionic coco bloom, great white, cal mag, Cannazym the water starting ec is 0.7