I think the Tahitian Moon Sand being possibly dangerous is another aquarium myth that gets spread about by people who don't want to risk it. But, as I've not tried it, I guess I can't really comment on it other than repeating those first-hand experiences from people who actually have kept it with those fish/inverts (like the above poster).
Anyways, I was going to suggest Flourite Black sand but held off because it is kinda expensive, but then you got it anyway, lol! I've got it in a 2.5g planted-only tank (mixed the leftovers with my gravel in 75g), and I can't stop saying how great it looks. The next tank I have (which will be awhile due to space) I'm definitely going to use black sand and probably use this stuff.