I recently purchased a CPR AquaFuge RF12 Hang-On Refugium for my 30 gallon reef tank. I am planning on filling this with live sand to supplement my crushed coral/aruba shell/live sand substrate mix. Outside of that, I have heard several different uses for a refugium, but I am interested in hearing advice on what to do with this refugium. I picked it up at a great price at a closeout sale without a clear plan on what I was going to do with it! I am fairly new to the hobby, so please forgive me!