Dont take this 100% but im pretty sure you could just buy some aragonite sand that wasnt "live" and use that in the fuge. Then take a little bit of sand from your tank and seed it with that sand, which will make the sand in the fuge live in a certain amount of time(unknown to me). That would also let your DBS in the fuge, assuming thats what your shooting for, grow into the system itself. Just seems like the right way to ease into it once your system is up. Now, like i said, I wouldnt bet any substantial amount of money on that, but logically it makes sense to me.