Need help to diagnose my plants

Hey everyone, my plants are giving me signs that it’s not happy, but I am really uncertain as to what it is, here is some info

Soil grow (light mix)
5 week of veg (has been topped twice)
I water give them about 200ml of ph 6,5 water every 3-4 days (so I’m most def not overwatering, more the oppesite)
I’ve given them nutes twice, rest is just regular hard water at 380ppm
Enviroment is 25C/75RH in light time
21C/85RH in light off time

I have a 1000w LED about 40cm from canopy (only pulls 340 from wall, scam ?)


Any improvements would be helpful as I really don’t know what to do from here only thing I suspect my self is lack on some nutrient as I really haven’t watered these guy much, even less with nutrients

more pictures of the overall grow:

Calcium deficiency. Potassium deficiency. Probably deficient overall and these two are just the obvious.

Thanks for the reply. I am really torn about this. Could it be too much calcium as i seem to have really hard tap water. And ive read that calcium toxicity often shows as potassium deficiency. I mean Calcium defeciency and toxicity looks alot alike to me somehow.

I've now tried to "flush" them all with RO water with a small dose of fullspec nutrients (150ppm), in hopes that it can reset it abit.