6 weeks 1 day flower leaf tips.

Hi guys its been 6 weeks and 1 day flower , tips look abit weird , not sure what could cause it?

Hps 400w
Canna soil
Feed every 4 days ( 4.5 L between 7 plants)
Fimmed twice
If you put top of hand under light it dont seem to be hot to burn.

Looks like either heat stress or nute burn to me
Do you have a thermometer and hygrometer in the room?

pH
Medium
temp
humidity
Stable?
Any variables change lately?
What do you see? What do you want us to look at. Theirs a few issues. Looks like the temp/humidity went out of wack for a day or two. Easily pH. .

The hand test is useless. I put my hand 3 inches from my 400. I wouldn't, couldn't grow without an ir thermometer. 75-80 depending on strain canopy temp. Your golden.

Did you supplement any N recently?

Nar i didnt , it dosnt get any worse kinda stays , i had before 600w in it was too much so i gotni down to 400 . It observes really slowly in leafs. Ph is fine use tapwater.
Temps around 30-35
Humity was high before but then i got dehymidty in tent and it got it down 45 ( plus/minus)

Feed , headmasta , potash , ionic bloom and every 8 days 1ml of ionic booster but ionic just started now as i ran out of old nutes.

Yellowing been for a little while , it kinda stayed didnt show any sign of getting wore.

To me it looks like moisture problems are you letting the pots dry properly?

And yellowing leafs it looks like cal mag deff, but the leafs that are drooping I don't think it's drying out well.

I had drooping leafs like that and the growth was slow, it was because the pots never dried well that's what caused it and the roots are drowning...

When pots are dry the roots spread looking for water it's what you want it to do buddy.

What I did to fix the issue I waterd less and let pot dry and then leave like a day or two extra then water so it was absolutely bone dry and leafs picked back up.

But I'm no pro this is just what I think because it looks similar to my past issues.
Hope it helps

This does sound like me , thanks will try it out . If i put 4.5l between 7 plants what would you say take it dow to about?

That I can't answer mate not enough experience lol, but what I'd do is water others as normal...

But the drooping one give it a day or two more and monitor , sometimes the pot will by dry on the edges but centre is still wet...

With the particular plant I had problems with I waited until I noticed little drooping from drought then waterd and same again let her dry untill she begs you for more lol she liked it rough lmao

Or wait for an experienced person to jump in