First grow after a 40 yr break, 1 plant, DWC, LED 450W

[MrWizard]

@HolyAngel

First big question is:
What do the roots smell like? If they smell at all bad then it’s definitely root rot. If it smells spicy and/or vegetable like, then the roots are likely fine and only stained.

They smell like forest loam, earthy, the good kind of earthy you smell in a healthy aquarium.

Here are a couple pics, Is this the start of root rot?