Good quality live rock and some time is all you really need. If you want some sand diversity, ask the folks in this forum if they can donate a cup to your system. I'll bet almost everyone would give you a cup, and you'll get just as much benefit. You can't have any of my sand because... well I have a BB tank.
-J
Personally i use live sand. The different refugium muds are fortified with iron which slowly releases for the macro algae. You have to replace the mud ever so often I think it's every few years or something like that.
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