What soil are you using? Some are inoculated with Micorrhyze fungus to benefit root development - not all fungus is bad. If the plant itself is affected that's when I would start to worry personally.
Bro 😉 everything's perfect 👌
Absolutely not, it's just liquid fertilizer, I have granules too. The water evaporating with the lamp or the sun can leave these nutrient residues on the soil, but it's all good stuff 😁