help with yellow leaves and rusting

[JeffGreen87]

It's getting rusty like and hard crusty. N it's. All mainly on a few plants and it's mainly I'm the middle area of the plant.

And the yellow is on about half my garden around low and middle area. And there all dieing.

.

This plant it's getting yellow then just dieing with a rust color.

Spec.
Veg
Distilled Water
Water temp 60/70
Room temp 72/82
R.H 25/40
Ph.5.4/6.3
10 gallon res
5mil masters a
3.5mil master b
Water 2x 15mins each. 6am/5pm
Lights 24hrs, 6500k 216watt 20,000lumens, avg 2/10inches away
Fan on constant
Flush weekly
5gal pots

 

[Stealthboat]

Hmm I'd say the fluctuating ph might be causing it, maybe keep the range of fluctuating smaller. Also 24/0 might be giving them problems, a dark period is beneficial from what I know.

 

[Tead]

Add calmag to your mix and watch your ph.

 

[Rifleman]

Definitely watch your ph swings. Here are some reference charts that might help also.

 

[autoWalker]

5 plants autoflower bubblicious
hi everyone.
sry for my english im russian.
i have this 5 seeds autoflower. 10 liter pot. regular soil from home depot. i didnt use nuts...
thy was really green in 3-4 days now thy lil bit yellow and the tips of the leefs are brown. not only the mine tip its all of the tips on one first leef. i dont know if u will can see on the photos.
i doing only water temp are 75-80f. lights are 4X55w 2700k 3300lm each. 2X55w 6500k 3100lm each. 4X26w 6500k 1550lm each. 5 plants total.
its 2 days thy dont grow thy just stay the same.. i really need some help.. in the start thy was speedy now thy look sick.
i have been spray water on them from a window washer fluid bottle.. but i washd it good.. but its still smelly.. meby its the water thats making him go bad? or i use nuts now for him to heal and become strong?