Help, photos included (leaf damage)

[stephan420]

Hi everyone,
is the damage below something I should worry about ? Is it bugs or heat stress?
Kindest regards,

 

[Moshmen]

What ya growin in ? Watering habits ?
have ya scoped for bugs?
personally I think it’s a water/nute issue
But we will need to know what your using and how often

 

[stephan420]

What ya growin in ? Watering habits ?
have ya scoped for bugs?
personally I think it’s a water/nute issue
But we will need to know what your using and how often

Medium Coco coir with a slight ammount of soil at a Ph of 5.8
Watering daily using terra aquatica by GHE. around 1 liter (idk if thats low or too much) but I feed when i feel the moisture of the coco is dryish
never saw a bug
feeding at a PH of 5.5 yet for some odd reason, runoff is always a sharp 7.
Should I skip the nutes for a while and simply feed PH water?
Thank you for taking the time to reply