IDK what's going on, PLEASE HELP!!

So my plants are about four weeks into flowering, growing in super soil. I'm using Earth Juice Micro & Calplex to compensate for minerals taken out thru reverse osmosis. My problem is my plants are getting ugly. I'll add a couple pics so if anyone can help.. I would REALLY appreciate any help I can get. I have no idea why this is happening. Thanks so so much in advance to anyone who can help.
Take care,
Ms Alijuana

The center brown looks like it might be an OZONE issue, not enough circulation. Possibly a burn, can you give us more details like nutes, amounts used per gallon, soil, temp, humid ect? Get many opinions before trying ANYTHING!

Thanks for replying.
The temp is 60-80 degrees varying, at night and while the lights are one.
Humidity is about 40.
I have an in-take vent & exhaust vent.
Followed the super soil recipe exactly. As for the Calplex & Micro, I add a tsp per gall of water & water four plants with a gallon.

I was thinking ozone too cuz there's this big empty fuel take that's just outside of the grow room and when I'm outside the room, I can smell fumes and they can make me nauseous if I stay by the tank too long... If you need anymore info to help me, I'm definitely down to give it to you. I gotta figure this out. It's driving me crazy!

If that tank is outside say the intake vent, you should move it if possible.

the intake vent actually takes in from a cold-air-intake vent on the floor above so i don't THINK it's causing fumes from the tank to come in. the tank is like 10 feet from the intake. but it's a HUGE tank so unfortunately there's no moving it =(

magnesium & other things are taken out of the water thru the RO filter & I've heard people compatre magnesium defic to ozone damage but i don't want to to feed with more magnesium and cause a lock out if that isn't actually what the problem is, ya know?

If you have a nute lockout just water next time with a tablespn of mollasses and one of Epsom salt and this should eliminate the lockout if that is what it is. These things will NOT hurt you plants, I ust this EVERY to EVERY OTHER watering. Indoors ad out.

is that what you think it is then, a lock out? it just seems to me like that should be the last thing i should have to worry about since the water is pure & i'm only adding calcium & micronutrients. the watering before the last, i used a tsp of molassess also. but other than that, nothing has been added... i'm just so confused, ya know? i just wanna make sure i don't make matters worse. these plants were perfect and beautiful until a week or two ago. it kind of suddenly happened, ya know? thanks again for the advice.

I appreciate the advice I've gotten so far, I just want some more input. =)

Bump! No one else has any idea what's going on? I really thought I'd get a lot of input posting here...

Id really need to see a pic of the entire plant to be able to help you any further than has already been posted sorry.