AK-48 and Ice Grow assistance needed!!!!

Okay this is my very first grown and after everything I’ve read over the past few weeks I decided to go with a DWC Hydro Grow.I’m growing in a 3x2x2 stealth box with an intake and exhaust fans, and a gallon reservoir.

I planted the AK on Oct 13 and the 2 Ice on Oct 20[SUP]th[/SUP] ( I was waiting for seeds).

As you can see I’ve had some early problems with my AK plant and no problems with my 2 Ice Plants.In the beginning I had water temp (78 degress) and humidity problems. Which I know caused some nutrition deficiencies and I also developed some root rot.

I’m using my local hydro shop of H202 to rid my root rot problems and I’ve add some root stimulator (advice from the guy from the shop).

I’m using GH Flora series as my nutrients.

I just recently noticed some new spots on some of my top leaves on the AK plant so I’m wondering what my problems come be.

PH Levels 6.0
Water Temp 65 degrees
Humidity 50

how often do you ph your water looks like it make be caused by ph flux

A few times a day. I'm was trying to keep it as close to 6 as possible. Is that to often? How often should I be doing it?

i would just adjust it every day or so how much does it flux

It only flux a few tenths

That looks more like nute burn to me. How much nutrients are you using?