What’s wrong?

I’m On day 6 veg(18/6) (light about 24” away) with 4 different strains and 2 of them are having problems.
Big bud white widow
Having brown spots and drying out on the tips of some of the fan leaves
Amherst sour diesel

Has really dark green color and looks as if it’s shriveled up.
I’m supposed to be feeding their second feeding right now. Megacrop 2g’s/gallon was their first, then I waited a day and watered with ph’d water(5. then I waited a day and now I’m here.
What should I do?

Typo
Meant to say 5.8 ph

Do you have air circulating between the plants and the light? Sometimes clones throw off some funky looking leaves too.

They are not clones but yes I have 2 4” fans at plant level but only ones on and 1 6” fan running on low about 6” above the plants just to circulate air

Also
My humidity was very high (76%) I’ve already taken steps to bring it down but could that have did this?
And what about the yellowing on the white widow? I doubt a fan did that, I think it’s from too much or too little of something or a ph problem!
Maybe ppm’s if they can cause this type problem!
Cal/mag???
I am in a coco/perlite mix

Have you sprayed them with something? I see different shades of green on the leaves. Yeah you don't want your humidity to stay that high for extended periods.

I spray with regular tap water after I water or feed them each time...no nutes tho!
I did spray with a diluted water/superthrive mix, that was about 2 weeks ago tho!

Superthrive has been known to cause deformities in plants. I prefer Thrive alive with Kelp. It has vitamin B-1. I guess it's ok to mist under a LED system but you could never do that under a HPS or MH.

Yea
All 4 plants are in a 2x4 tent under a 600w led but I dont plan on using st again anyway! Do you think that caused the problems? Wheather or not...any ideas on how I should fix it?



***side note***
Do you think a 2x4 tent w/ 600w led (at least that’s what the manufacturer claims) is ok to scrog my 4 plants?

The space sounds a bit tight. The plant will correct itself and grow out of it over time.

Ok thanx