Sand

[sal713]

I'm starting another SW tank. It will be 20g with seahorses. My question is, I've seen colored sand in my LFS..green, black,red, etc.
Is this stuff ok to use? Other than it not looking natural, is it safe?

 

[cprdnick]

Are you sure it's not reptile use? I personally wouldn't recommend any kind of substrate that isn't Calcium Carbonate based (Aragonite). Any other kind of substrate in a marine environment wouldn't provide the proper buffering and may leach something into your water, especially the colored stuff.
Clint

 

[wayway]

I dont know about those colors but I do know that there is pink aragonite sand that is really good for a sw tank. It has calcium and good bacteria. So if you like pink you could try and find some of it at a pet store.