Mold or salt?

[Arnis&Weed]

So noticing this white stuff reminds me of white powdery mold. But using auto pots and coco I’ve heard the salt from the fertilizer rises to the top. The auto pot has only been on for 4 days. Can the salt move up that fast? Or is this mold?

 

[JP1]

It's neither. It's fungus, it's normal, and it's nothing to worry about. Won't bother the plants at all. You'll eventually see the salt buildup on the outside of the fabric bags and it'll look crystalized

 

[Arnis&Weed]

It's neither. It's fungus, it's normal, and it's nothing to worry about. Won't bother the plants at all. You'll eventually see the salt buildup on the outside of the fabric bags and it'll look crystalized

Thank you kindly