New Grower wondering what happening to my plants

Obiwan bluntobi

New Member
Hi so this is my first grow and about 4 days ago I noticed these brown splotches that have slowly been getting worse . It’s one month old and the medium is FFOF. It’s been in my that for about 3 weeks now. Only feeding PH’d water and cal mag.
Temps are 74-80 Rh%50-60
any help would be greatly appreciated.
 

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Temps and RH are fine, plants look good! I would start fertilizing, the FFOF soil only has preloaded nutes for about 3-4 weeks. PH your nute solution to about 6.2 if using synthetic nutes.
 
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