Brown spots - sun burn?

Any thoughts? They looked great a few days ago??? Now there’s brown spots and they look sick and wilting! Too

roots are perfect.
Two weeks old
Browsing indoors
Ph6.0
Temps is 80deg
Humidity is a bit low around 40%
Ppm 410 (700 scale)

i had another look and things I can think of:

May water was above the bottom of the planting basket (RDWC) so maybe water levels too high?

lights were at 24” so I raised to 36”

turned my exhaust fan down to allow more humidity to build up.

good fixes?
any other suggestions based on you experienced RDWC guys?

Your air temp might be 80 but what is the temp on the leaf surface? do you think it might be higher? I ask because it really looks like you have heat damage.

polishpollack said:

Your air temp might be 80 but what is the temp on the leaf surface? do you think it might be higher? I ask because it really looks like you have heat damage.

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Yeah a lot of guys we’re saying my ph was too high and that cal won’t uptake past 5.8 and I’ve been hovering 6.1
So I did lower to 5.5 and will let I rise to 6.0 and keep that cycle

but I agree it looks like heat. I do have fans blowing on them and some ac coming in near them but just in case I raised the light from 24” to 36” just in case.

I wonder if that explains why my plants are growing outwards and not upwards?

Yes, that exactly right. When light is close to a plant, it will grow out instead of up. This is the opposite of the stretching that takes place when a light is far away. The problem with low lighting is the heat damage that can happen. You have to find the best distance between plant and light.

polishpollack said:

Yes, that exactly right. When light is close to a plant, it will grow out instead of up. This is the opposite of the stretching that takes place when a light is far away. The problem with low lighting is the heat damage that can happen. You have to find the best distance between plant and light.

Click to expand...

I had fans blowing right on the plants which which was stressing the crap out of them hence the purple stems and was causing brown wind burn spots and not allowing them to breathe.
I thought it was strange that new growth was coming in fine with no issues just the bottom leaves....
Anyhow thanks for the help!