Never used black sand for Salt water, however if I set up another tank, I will with out a 2nd thought. Kinda wish it was easier to switch my current tank to the black.
Ive used it for my Goldfish who I keep at a ph of 8.5 so the buffering is no issue. It obviously doesn't help keep your ph up, but not having an aragonite type sand definitely does NOT affect my ph in any way. (No live rock with them either since they are goldies...) They are always on the bottom chewing on bits of sand hoping it has food left in it and have seen no damage to mouths or gills. So can't imagine it causing too many issues for most inverts.
Have also used it with Cichlids and some have been "burrowers" and again, no issues with it harming any of those guys, however my Yellow labs did end up with a bit of a black tinge to their slime coating when it came to always hiding in their cave.
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