It Is Magnetic, Hence it has metal in it. lets say the metal is not a issue to water quality. The issue occurs when you go to clean your glass with a algae magnet. Do yourself a favor and don't do it. Otherwise manually clean your glass.

This is basic black sand for saltwater that makes everything pop. It's fine enough to use for seahorses and also invertebrates, and looks amazing.

The fine texture allows this to stay UNDER prettier gravel. And it is gentle on the bodies of bottom dwelling creatures. I did have a lava rock on top and switched to a white rock on top because I found that its was to sharp, showed a ton of dirt, encouraged to much algae growth and the black on the bottom and a dark black ground caused me to kind of "lose" fish. I didn't see my cory cats to often, my neons hid most of the time.. so the gravel is great structurally, but consider how you will use it

It enhances the colors of the fish, visually more depth to the aquarium and the bonus of having nitrifying bacteria to establish the nitrogen cycle. Very pleased and would highly recommend it.

Great product for my Tank, didn't cloud up the tank and all my levels stayed in range.

This gravel is really small but definitely gravel NOT sand. It's exactly what we wanted. We didn't want a large gravel to hold ammonia. Our goldfish love to pick through it much like parrot fish on a reef. It did take a week for the cloudiness to go away. Not sure if part of the problem was our Penguin hang-on-back filter - could have been. We tried the product that came with the gravel (a real bonus!) as well as another product. But I think mostly it took some time. Not a big deal though. It was definitely worth the process. There is quite a bit of white rock mixed in with the black (probably 85%/15% black/white). Looks really nice. I'd buy it again and probably will for another larger tank.

Great looking sand. Just be aware that some pieces are magnetic. Will stick to glass cleaning magnet.

Do not get if you are starting a reef tank. There is metal in this sand. It is picked up by a magnet so eventually it'll leach metals into your water and kill your corals.