I have some seedlings growing in light mix and I started to feed them with TA grow+bloom ( as suggested for first week ) , Rootbastic and Atami cal-mag.
Liquid ph 6,5
They are under a 480w custom lamp, 18 cree leds at %40/50 power.
Lamp is 70 cm above the seedlings.
Temp 24-25⁰ C and 19-20⁰ C when lights off.
Humidity % 60-75
These spots started to appear on first set of leaves of one plant , then on the fan leaves of other plant standing next to it in last 3-4 days.
They were given Cal-mag on last 2 waterings.
They were standing in the centre and I moved them to the left side of the tent today , just incase if it’s related to the lamp.
I checked many topics about light burn, cal-mag issues, nute burn and also septoria and even viruses but I could not make sure what is causing this.
All other 18 seedlings are all right and growing nicely.
My opinion is ; it might be related to root booster, and maybe a bit over watering ( no holes under cups , because I will transplant them nowadays ) but I cannot make sure. Or maybe it’s still cal-mag
Hard to say… Personally, I would ride it out as the overall health is looking good besides those spots. Could just be throwing a fit when in reality the plant is fine
How’s your humidity? I had a few crinkly leaves like the last pic until I started running a humidifier, went from 50 to 70% humidity and they seem happier
Keep your trigger finger off that water and let them dry back a little.The combo of the root booster and a lot of water pissed them offThe little dots all over look like vascular from some root disturbance.They should grow out of that.Go by the weight of the cup rather that watering everyday out of autonomy.
Thanks for reminding @Rgaaana , let me edit. It’s %60-75 since the beginning.
This was a one time over watering and all others received the same amount. Maybe it’s not even much water, I beleive so cuz there are no holes. I never water daily, always let them dry and weight the pots to make sure.
I suspect if the inner surface of the pots ( paper pots , not plastic) might have been an effect.
The water is pooling in the bottom and the roots are setting in it then.Root rot sets in pretty quick and thats one thing once the damage is done its done.If you catch it quick enough you can still bounce back
In that case , making some holes, giving a flush and repotting seems to be the things I should be doing. Yes, root issues due to the pool makes sence Thank you @CapnCannabis
, thank you sir 