Should UV kill diatoms?
I have an Aquatop 400 with the built-in UV bulb (on 24/7) and am having a major diatom outbreak on my tank that I am blaming on the fact that my new substrate (Turface) is 5% silica.
Based off your posts, you just started your tank over less than a month ago? If this is the case, diatoms are normal. Pretty much any snail or algae eater will help take care of them, otherwise. Amano shrimp and oto cats will all gobble on that fuzzy stuff the OP has.