Lastbud

I have a seedling I’m bringing up but the new leaves seems to be getting yellow edges !!!the medium is coco coir and ph is 6 including run off water
What could cause that???

Smoking one huge roll on of blue cheese mixed with 3kings OG while on the best weed site there is
HIGH ON

What can I do to lower my humidity in my grow tent ?

There are some white/bleach spots on my weed plant leaves ....doesn’t look like trips or any fungus ,any ideas?
I came up with a suggestion that it could be when I flushed them ,I had them under the shower and left for about 10min .
Could the chlorine from the water bleach the leaves??? Only the newer shoots have it