New at this

Any one know why my second bottom leaves are turning gray and whittling other leaves are fine

Picture please

No pics look like a kush plant with bottom leaves wilting and white spot on mid leaves

white spots? how long ago did it happen? could be bugs or a lack of cal/mag which will turn rusty looking after awhile hard to say with no pics, just look at pictures of plant problems and see what you can find. very well could be a ph issue cause from bad soil.

Im useing dwc and my ph is 5.7-5.9 check it 4 times a day I also use calmag plus

umm well, we need alot more info age of plant temp of run feeding schedule whats your ppm running we need some info and a couple pics would be the most help.

looks like your roots could be rotting?

How do I fix that

My set up is water farm from gh air pump with stone in res with floraseries micro grow Bloom calmag plus,rapid start, super thrive in distilled water ppm meter ph meter coralife light, fan, no temp yet

well i dont grow hydro so you need someone that does grow hydro to help you more then me, but by looking at your stem it looks like its rotting, are you feeding yet? whats your ph whats your ppm? of the feed? but to me it looks like your watering to much and it causing the roots to rot, but i am pretty sure if your feeding to strong you can burn your roots as well im not 100% sure but i think you should be feeding like 300-400 ppm not 100% sure, can someone with more knowledge on hydroponics jump in and help him?

Ph 5.7 ppm 1300 for week 3 veg

just because your plant is 3 weeks old does not mean it can handle 1300 ppm, 1300 ppm is like mid to late flower for most strains thats a high dose, i see most people dont go over 1000 ppm in veg. i would drop your ppm to a mild 200ppm/300ppm

That's what I figeured I followed the gh floraseries chat and I thought it was to high thanx how tall should it be for that ppm

Stem rot.. Its done.

Is that a yank it and start over