FORTY ONE AND COUNTINGYour question is the subject of forty page debate threads I guarantee it
I always start with: if you reached in and grabbed a handful of sand and then dropped it down, would it cloud everywhere or fall like snowglobe flakes/no silting
That SB drop test identifies the feed
Next is shifting down whites in lighting and making it more blue for a few mos... corals don't mind. For your persistent diatoms (imo) I think they can be beaten with a clean sandbed and less white every time.
This invader is directly impacted by uv use. The way to win would be the clean sandbed first, all else after.