I don't think so. Most of the reviews I've read, people said they didn't have issues with it being magnetic. I think it's a little harder to keep clean.
Just watch your alkalinity. You might have to dose more and sooner with not using aragonite. Is it volcanic sand?
No. And it says it doesn't buffer. So I don't know if it'll cause issues. I hope it works out. I like the look.
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Looks good! I'm interested to see how the black sand goes. Have you used it before?
Black sand for the black bedroom: