Clones with brown spots on a few leaves

[Freshlybaked]

Help I have some clones in a 3x3 tent with a spider farmer 1000 dimmable light.I'm starting to see a few brown spots on some of the leaves and a few of the clones have kind of twisted looking leaf growth on top I've had a few issues with couple nats nothing major and a couple centipedes but nothing on the actual clones was wondering if this could possibly be because of potassium or magnesium lacking because of a recent switch from a tap water to spring fed water? Anyone can help please do so Thank you

 

[Gjourney101]

What's your pH? I'd start there.

 

[Freshlybaked]

Temperature in a tent is 75 humidity is 55 pH 6. 0 - 6.5 I've been pulling from Spring fead water lately and it is way lower on PPM but sometimes the pH is off a little bit and I've just been snatching a cup full of water out of it with no nutrients and just putting a little bit to get them to take off I've noticed the roots grew really quick and are sticking out the bottom already after about a week but you're right I haven't been checking the pH each time because I'm just grabbing it not thinking and watering plus this water is kind of stripped of anything calcium or potassium should I switch back to my tap water maybe since it has that stuff in it and it's been fine in the past?

 

[Freshlybaked]

Actually I just checked my other reservoir and it is kind of on the high side closer to 8.0 dang it I don't know how the pH has raised that high It is spring water also maybe the container I had it in at first

 

[Gjourney101]

pH naturally raises, spring water is no exception. I've never experimented with spring water, it could be a liable option, but the matter is pH. There are impurities and minerals in water that can naturally raise/lower pH, sometimes dramatically. You need to check you pH and make sure it's in the correct range every watering. pH fluctuation can be damaging. Also, if your pH is off that much nutrient lock out occurs. You need to keep it a steady 6-6.8. I'd give it a few days or a week, monitoring the pH of the water administered.

 

[Freshlybaked]

Thanks so much I will do that and hopefully have good results I'll let you know then! Thanks again I appreciate it.

 

[Gjourney101]

No problem hope this resolves the issue. If not, make a new thread or update this one amd we'll keep going down the list.

 

[Freshlybaked]

Hey just to let you know I pH'd some good spring water and added a low dose of cal mag and it seemed to help the plants tremendously but I've started noticing some light green areas on the new top leaves starting from like the base of the flower to the outside of it but I don't know if it's just because the plant is growing new or if it's having issues but just to let you know the pH seemed to maybe be the issues also needed a little higher humidity so thank you for the advice