Purple Kush 25 days flower leaf problem

[marshp69]

Hey just wondering what might be the problem, noticed some of the leaves on many of the plants have started curling up and are showing brownish/yellowish colors on the edges of the leaves. Pic is shown on the link below.
Any help much appreciated. THanks.

https://www.rollitup.org/marijuana-pics/index.php?n=28333

 

[Where in the hell am I?]

Looks like possible nute burn or deficiency. Also resembles heat stress. Are n-e of those a possible factor, as far as ya know?

 

[marshp69]

Looks like possible nute burn or deficiency. Also resembles heat stress. Are n-e of those a possible factor, as far as ya know?

Well it's hard to say, im putting 600ppm of:

Conniseur Part A
Conniseur Part B
Big Bud
Sweet
Grandmas H2
Few drops of superthrive

Doing feed, feed, flush, feed feed flush.

 

[Stoneded]

That's the problem with using so many additives, when something goes wrong it's a lot harder to pinpoint the culprit... That's why I prefer keeping it simple, veg nutes, flowering nutes and rooting hormone.

 

[BeCeLivin]

With PK , do a feed flush feed. They are very finnicky. Looks like a minor problem give them a good flush and keep and eye on the problem