I'm tring to find out if tropical sand made by pavestone co. is safe to use in aquariums? I read on google that if it is safe for kids than yes it is safe to use in a sw tank but not a fw, because it would raise ph lv's. I also read that this is the same company that makes downsouth ,but i looked on there site and i cant find anything to support this. So if anyone know or uses this please let me know. THANKS!!!!!