White spores? Also extream burn not sure what to do

Anyone know what the whit moldy stuff is.? And if I have no nutrients in my resivoir. Should new growth be unaffected

Looks like it could be Mycelium. My buddy has had this issue in the past, but his fix would only work for his growing medium which is soil. I suggest a google/site search, it should be pretty easy to figure out a cure, but again- I'm not even sure that's what this is, or that Mycelium can even grow on your medium.

Your growing in rockwool I'm guessing. That white stuff is fungus and it WILL kill your plant fast. Go look up a video on YouTube called "drying plants up close & personal". It should be the very 1st one. It shows the very same thing you have going on.