Many little brown spots on leaves

Hi
Setup/Conditions >

• LED
• Temp 26C
• PH 6.5
• PPM 400 < Tap water 100ppm < Advanced Nutrients Bloom/Veg/Micro and Epsom salt
• Aeroponic > 2 plants per container, total 3 plants, 1 is alone in another container
• Strain > Eden CBD

Plants are small and just starting out. One plant as seen on picture is sharing the container with other plant, this one is showing some symptoms, other one is fine. Its also drooping a bit.

Plants are in rockwool which are in air pots, surrounded with clay pebbles.
Root system is just developing and you can see some roots coming out under the pot. When i planted them in the system, the sprays which are in the system were turned 24/7 on. Plants almost died, i turned off the sprays and they revived quickly < too much water or is even that thing possible? I turned the sprays on for a minute after 2-3 days period which i am still currently doing. Everything seemed to be doing well but one plant of three is showing these symptoms now.

What would be causing that? Not enough aerated water? Nutrient problems? I have no air stone in the containers, 10 small sprays which are on the sides of the container. Maybe something else? Please let me know what do you think

This: " PH 6.5 "

You'll want to dial in your pH for the style of grow you're attempting; with research, I think you'll find it's too high. Fix it and your problems will most likely go away. Presently it looks like a Ca issue, but I would bet it's because of your pH, not because there isn't enough Ca. Good luck

CannaCountry said:

This: " PH 6.5 "

You'll want to dial in your pH for the style of grow you're attempting; with research, I think you'll find it's too high. Fix it and your problems will most likely go away. Presently it looks like a Ca issue, but I would bet it's because of your pH, not because there isn't enough Ca. Good luck

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Hello, thanks for answer. Im gonna get into it asap. Do you know anyhing about ph being unstable? When i made the water, i made it pH5.5
When i stared out, i used RO water ph5.5. After a day i checked it and it was about 6.8-7, cant remember correctly. I lowered it again to 5.5. Next day i checked it again, it was still over 6, not sure what exactly, but remember it being too high. Lowered it again, and day after it still was unstable. What makes that so unstable? A friend of mine adviced me to get higher ppm so that makes the water more ph stable? Thatswhy i currently use tap water and epsom salt. Could anyone confirm this? I kind of trusted him since he was also a aeroponic grower.

Raisk said:

Hello, thanks for answer. Im gonna get into it asap. Do you know anyhing about ph being unstable? When i made the water, i made it pH5.5
When i stared out, i used RO water ph5.5. After a day i checked it and it was about 6.8-7, cant remember correctly. I lowered it again to 5.5. Next day i checked it again, it was still over 6, not sure what exactly, but remember it being too high. Lowered it again, and day after it still was unstable. What makes that so unstable? A friend of mine adviced me to get higher ppm so that makes the water more ph stable? Thatswhy i currently use tap water and epsom salt. Could anyone confirm this? I kind of trusted him since he was also a aeroponic grower.

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.Smoke said:

My pH keeps fluctuating, what’s going on? | Homegrown Hydroponics

So you set the pH of your hydroponic reservoir to 5.5 only to return 2 days later to find the level has risen to a pH of 6.0! You’re wondering why the pH won’t stay where you set it? The nutrients you add to your reservoir are acidic. When the plant consumes these acidic nutrients, …

hydroponics.com

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Okay thanks for that info, but does it makse sense that a plant smaller than my palm can swing 20L of water ph from 5.5 to about 7 in a day when its barely consuming any nutrients?

Also, how to explain the plants coming back to life from the grave after i turned off the sprays?

Raisk said:

Okay thanks for that info, but does it makse sense that a plant smaller than my palm can swing 20L of water ph from 5.5 to about 7 in a day when its barely consuming any nutrients?

Also, how to explain the plants coming back to life from the grave after i turned off the sprays?

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My ph swings dramatically sometimes too. Can have to do with temp, ppm, container type, etc. Besides getting a larger reservoir I haven't found much to help with it.
As far as them coming back to life when you turn the spray off, it sounds like they are being overwatered.

I would hop over to the hydroponics/aeroponics thread and see if those guys can give you a hand.
I grow hempy so not much help there.

Raisk said:

Hello, thanks for answer. Im gonna get into it asap. Do you know anyhing about ph being unstable? When i made the water, i made it pH5.5
When i stared out, i used RO water ph5.5. After a day i checked it and it was about 6.8-7, cant remember correctly. I lowered it again to 5.5. Next day i checked it again, it was still over 6, not sure what exactly, but remember it being too high. Lowered it again, and day after it still was unstable. What makes that so unstable? A friend of mine adviced me to get higher ppm so that makes the water more ph stable? Thatswhy i currently use tap water and epsom salt. Could anyone confirm this? I kind of trusted him since he was also a aeroponic grower.

Click to expand...

I would think the tap water would make things more stable as your friend suggested. My pH will swing, but it's gradual enough over time that it's not an issue for me. As suggested, it might be best to post this in the section under your grow style and see what some of the others have to say. Sorry I can't be of much help. Good luck.