I went to a few lf stores and the prices on that mirical mud is pretty outrageous. One place had about 1lb for $54.00. That would cost a fortune for me. I allready ordered a new sump that has a built in refugium. So i am trying to get everything togeather right now that i need. If my refugium/sump is 30x24x30in how much mud do i really need to do this right?