Issues with 1st NL grow maybe nute burn - need confirmation

Starting 4th week of grow
8 site Ebb and Flow
Rockwool plugs with Hydroton
Using Bonitcare nutes
Pure Blend Pro Grow
Pure Blend Pro bloom
Liquid Karma

Also - Superthrive
H2O2

After 3 weeks I added nutes based on the label. I know, I know. now at least. I caught it after a few days. Dumped most of the Res. and refilled with water(tap) PH adjusted water checked TDS and it was 500. Let it go 2 more days new growth looked good but the browning continued. Got worried and dumped res again cleaned everything only PH adjusted water. Checked the TDS of the water at start 68. Let it go for 24 hours, conditions worsened. . Checked TDS of water after 24 hours 71. Plants still not looking any better, maybe worse.

PH always rises. Try to keep it at 5.8, but I know it was over 6 for at least 2 days maybe more.

Added nutes back at 25% and TDS was 475.
PH 5.8

My thoughts are its nute burn or a PH problem

Any suggestions?

Kinda looks like fungus to me

Looks like a deficiency try some cal-mag

i would flush it out just to be sher it isint nuts and then wait it out 1 leaf wont hurt if it starts to spread cut off those leafs and save the rest of the plant but it is to early to start cutting right now wait it out and flush the soul also could be from the heat what kind f lights are you running and do you have good ventilation keep it up your plants wont die that is why they call it weed!! keep it up nice tokin have fun if anything call it a life exsperiance..

Lighting T5 8 bulb by 2 feet
Small closet about 2 by 3
Small vortex fan pulling cool air
Exhausting into attic

Temps stay around 80 degrees
Humidity 47%

get your temp to 70-76 and your plant will be fine it is just to hot in that small room open up the closit door atleast 2 hours a day if you can and you will be fine gl growin have fun!!!!

Bump for today

They are looking much better. Got the temps down and relaxed a little.