Sick plants?

[Buddua]

Hello I’m new here. My clones have done well for the first few weeks I’ve had them they were potted in FFOF soil with 40% perlite added. Just recently I’ve noticed a big change in these two and could use some advice. When I adjust my PH I get my water to 6.0. I use an LED grow light and I have not started any nutrients yet due to the soil containing many. I wanted to prevent burning the leaves.
There are brassy spots that spread on the leaves and A yellowing border on a few of them. These symptoms are starting to show on some newer growth and I would like to know how I can fix this. These two are about a foot tall.
The larger lady is Boy Scout cookies
The small one is copper chem haze.
Just a new grower trying to catch my mistakes before it’s too late.
(Pictures were taken in natural light not in their grow room)

 

[Pennywise]

Possibly a magnesium deficiency you may want to try a light nutrient feeding.

 

[Buddua]

Possibly a magnesium deficiency you may want to try a light nutrient feeding.

I was assuming it might be a nutrient issue since they have not been fed and they are no longer small I just didn’t wanna damage them more than they are. I will try a light feeding!

 

[Southerncough]

agreed. I used to have that issue that seemed to clear up after I started using Magpro from Dyna Gro

 

[Pennywise]

Dynagro is an excellent product

 

[Southerncough]

I used to be all over the place with bottles from different brands going into the same feeding and a lot of my issues went away when I committed to the full Dyna Gro line and feed schedule. Also like that they're reasonably priced and super easy to use

 

[NuttyProfessor]

Are you watering well , getting a good run off 20 % or more , its just the soil looks very dry and there is a tad burn ,

is there a tiny bit of spider mite damage too ? pic ( 2 ) zoomed in ( worth a check )