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They're just moonlights. You could get away with just the MH, but I wanted more blue than what the Phoenix provided, so I added two T5s (blue+ and purple+) in my canopy. I'm not sure why the fans were so noisy, I don't recall them being that noisy before. Maybe a good cleaning will silence them.

You can test that saltwater until you use up all of your GH reagent. GH is used for freshwater. You just want to be concerned with KH. Your KH level looks to be a good level. I'd work to get the Nitrates down through some sort of export (water change or chaeto or both).