reefphilippines.com

I don't really see why not? Kung meron lang akong access sa saltwater beach sand dito sa Illinois, I would probably use it.

Depende siguro sa type ng beach sand. Yung itim, "margaja" ang tawag namin sa Ilonggo, I won't recommend. It sticks to magnets and is of iron ore origin. Yung grey naman, I think that's OK, silica based siguro. What I'd look for is the white aragonite sand, tipong Boracay sand, coral based if I'm not mistaken. This has a buffering effect on the aquarium, raising your dKH, which is good especially if you keep stony corals. At mas maganda tingnan.

My opinion only, not backed by science, so take with a grain of salt. Or sand

also, grab some sand from a beach where it is carbonate from the reefs. Try not to get it from near a populated area, and try to get it from the surface where it is tumbled a lot by water.

yan, suggested na by eric borneman