I'm gonna say a definite NO NO NO on the all purpose sand. Did not have a good experience with it and it's still up in the air whether it's safe or not. I made a thread on it previously, search for it and you'll see what I'm talking about. If you can get your hands on Pool filter sand then do it but I know that there are some areas where PFS isn't available (like, where I live) and Playsand is okay as long as it says on the bag that it's aquarium safe. Playsand is really dirty and requires a lot of rinsing but it works great.