Diseased leaves on indoor 3 week old auto’s, please help!

[Curlythekid]

Hi guys,

this is my first grow and the plants are all around 3 weeks old except for one which is clearly younger at around 3-4days old.

They’re showing signs of a nutrient related issue however I’m not sure how to act and would really appreciate any sort of advice on how to help them out.

Temperature ≈ 25°
Humidity ≈ 40%-60%
Nutrients -> I initially fed them on their second week however one displayed signs of a nutrient burn therefore I discontinued nutrients and have just been watering them.
Water -> Very hard, I live in a very hard watered region.
Any help is greatly appreciated, thanks!

 

[ezenzyme]

Well well well, what have we here? Were going to need some more information on your jam here, also do you have a PH and PPM testing method?

Soil Growers:
1. Are you growing from seed or clones?
2. How old are your plants?
3. How tall are your plants?
4. What size containers are they planted in?
5. What is your soil mix?
6. How often do you water and what type of water do you use?
7. What is the pH of your water?
8. What kind of fertilizer do you use and what is its NPK ratio?
9. Do you foliar feed or spray your plants with anything?
10. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights")
11. How close are your lights to the plants?
12. What size is your grow space in square feet?
13. What is the temperature and humidity in your grow space?
14. What is the pH of the soil?
15. Have you noticed any insect activity in your grow space?
16. How much experience do you have growing?