Hi all! So I have a couple questions about sand substrate. Before I knew anything about anything with fish, I bought RepTerra sand from Walmart cause I thought sand was sand, and used it in a brackish water fiddler crab tank. Now that I know a little, I'm curious as to whether this is ok or not to use? I want to change to a freshwater tank now and was planning on washing it out, but I just don't know if this stuff is even acceptable for aquarium use. Not to mention because it was brackish, will washing it be enough to make sure the salt is gone for the freshwater fish? Am I better off just buying new sand out right? I put a picture of the type of sand it is, and thanks for any help!