Need help! 3 weeks old plants

Hi Crew!

Plants are small for more than 2 weeks and bad things are happening to them. I have a problem and cannot identify the cause. I tried to compare it to a shortage of fertilizer. I was wondering if it is kind of mold... The only thing that comes to my mind is some problem with the soil.

I am asking you for help.

Lighting:
- Luiminus CXM-22 COB 3500K 90cri 2 x 50W
Supplementary lighting (after 3 weeks):
-CLU058 3500K 90cri 4 x 77W
Temperature: 23-25 degrees
Humidity: 45 to 66%
Lamp distance from plants: 45cm
Lighting cycle: 18/6

- Air blending fan present (does not blow directly into plants)
- Ventilation also present (supply and exhaust active)
- I water them when the pot is light. I don't want to drown them.

UPDATE

Does it a mold?

Looks like you splashed nutrients on them when watering a while back

For the record I despise hydroton clay pebbles
it ends up everywhere

You need to get your PH straightened out asap or you'll lose them for sure. 9x outta 10 that's the issue.

I was using the same soil and water during summer when I was growing 6 plants on my terrace. That`s why that problem seems odd.

What exactly is your medium?

PanJapa said:

I was using the same soil and water during summer when I was growing 6 plants on my terrace. That`s why that problem seems odd.

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Ah. This could be it right there. Nutrient build up can look almost exactly like pH problems because they both cause nutrient lockout. These plants definitely look like they could be experiencing nutrient lockout. If you solve the lockout issue they should bounce back. Or start over. Either way I wouldn't continue to use that medium as it is.

MickFoster said:

What exactly is your medium?

Click to expand...

Universal soil from the supermarket. With pH between 6-7.

Killaki said:

Ah. This could be it right there. Nutrient build up can look almost exactly like pH problems because they both cause nutrient lockout. These plants definitely look like they could be experiencing nutrient lockout. If you solve the lockout issue they should bounce back. Or start over. Either way I wouldn't continue to use that medium as it is.

Click to expand...

I did remove already a clay pebbles. I`ll move plants to bigger pots with new soil. I bought now a Plagron Lightmix. I gonna remove as much old soil as possible and I will see after week them condition..

I have to think about hydroponic as well, there you have more control.

Personally, I would start over with a better medium.

Good luck.

Hey Man, just to add to this conversation, your seedlings need more light. They are very stretched out. I won't say anything about your soil as I grow in coco but there is defiantly a need for more light.

Hello Crew!

On Sunday, I put them into pots made of bottles for trial. I found that if I had to throw them away anyway, I would not move them into large pots. I removed the old soil from the root ball as much as possible. It's Wednesday, 3 full days have passed since transplanting.

Each of them improved and increased, I think faster than in the last 3 weeks. I come to you to confirm my conviction or to cool my optimism.

I have new seeds. I can start over. I am asking you for feedback.