Dino ID + Treatment

[EnterName]

Ugh, UV package is delayed and in USPS limbo.

Nutrients:
NO3 24.7
PO4 .31!

Tank is looking really good though, just a light dusting of brown on the sand, the rocks are not covered like they were, and the back wall is starting to clear up with the snails help. No redish brown hue anymore either, just brown. Pumps are staying cleaner as well. Have not been UV sweeping, just letting the sand do its thing and basting areas that are ugly as I see them.

Glad it's getting better.
Have you checked under a microscope? Still "pizza" diatoms (cf. Licmophora) or something else now?