The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
milmokes... what part of PA are you at? The Oldcastle/Southdown may become available again in a few months. I got a few bags from the Lower Paxton Home Depot outside of Harrisburg last spring/summer. I think that PA is prime Sand-Hunting grounds when it is in season. ...And there is no bag limit!
If you have a large population of corals, snails, or clams you will need to replenish Calcium and Carbonate regardless of what type of sand you use. Aragonite doesn't dissolve much at normal reef conditions so don't let the myth that aragonite buffers influence your choice.