Do not use any of the products labeled "bone aid" or "calcium substrate". These are made of calcium carbonate, and they will change the pH of your tank water. If you have problems with your tank being too acidic, you can add a small amount of this, and it will solve the problem, but too much could make your tank too alkaline.
I'm not sure about the Repti-sand, it might be OK. It probably isn't made for aquatic setups, so I'm not sure how it would behave. But for less money, you can also use pool filter sand, or play sand. The problem with play sand is that it contains a lot of dust, so you have to rinse it a zillion times before using it.