Potassium def? looking for your advice

Hello guys,

looking for you help

These are the plants:





This is the set:

Clones in 4th week in flowering.
Alga Bloom (06/12/10) 7ml in 1 liter water.
Hesi root Complex 5ml in 1 liter water.
water in 3 to 3 days (feed in all waters) (soil is completly dry after the 3 days).
~85F

From what i´ve researched this looks like a potassium problem, because of the curl up and the brown leafs.

What do you guys think?

Should i stop Hesi, or maybe change waters to one feed and one water only?

Thanks for your advice

looks like a mag or iron issue as well.

Thanks for the reply, should i add more nutes??

The leafs feel crispy also

tbh, i would check to see if it's an environmental thing before applying any nutes. from there, check ph and ppms from your runoff and it will tell you what you need to do from there.

Could it be from too much heat?

Whats ppms?

Thanks