Plant Issues - First Grow with Pics

Hey all,

This is my first ever rollitup post, so please be nice.

I have been reading most of the forums for a few months now on tips how to get my first grow up and running.

My current setup is:

1m x 1m x1.8m Budbox
4 Pot Wilma System - running drippers 3 times a day for 15 min
400w HPS current vegging 20/4 - into 3rd week.
Temps 20-25
Nirvana chrystal seeds
PH 5.8-5.9
PPM at 400-450 - Using forumlex and grow


Out of the 4 plants 3, look relatively healthy, but am having some problems diagonosing what is going on with one.

The bottom leaves have gone crispy and have blotches of yellow.

Part of me thinks it may be nute deficiency. Last night I added some cal mag, but just wanted to borrow the experience of you guys on here.

A week ago I sprayed my babies with neem oil, but foolishly did it during light cycle. Is this a sign of burn on the leaves?


Pics attached.

Any help would be really appreciated and feedback on my grow so far.

Much love.

Whybird

ive got my ppm running at 1000ppm, maybe a little extra feed? Formulex i only use for cuttings, step up to different nutes i'd say

nice setup man. I think you need a bit more nutes or something.. don't let them starve. peace

Cheers dude. I planned on doing a complete res change over the weekend, so will up the nutes and see what happens.

Would you stop using forumlex now and move over to grow?

deffo, formulex is super weak, fill yer res full of gro juice Well strong enough to handle it

Appreciate the help man...

Unfortunately this is the sort of hobby where you learn from mistakes.

Any other suggestions would be great.

Unfortunately? I feel most fortunate when I mess something up and then mend it back this hobby is the best hobby one can have

we all start somewhere, without the odd fuck up you would never advance its a learning curve and my favourite hobby/pastime. change the res, assess every few days, i'm positive they will bloom

Quality. I am hoping my babies can survive the winter and I harvest just after christmas.

Generally speaking do they look healthy enough?

depending on the age of your plants will depend on the ppm levels for the plants nutes. at flower 2+ weeks im running 1000+, to me 1000 for you right now seems like alot. best to flush with plain ph'd water for a few days then slowly add nutes again. or you can try foliar feeding them at 1/4-1/8 strength nutes.