Do you have a special need for biological filtration that live sand or rock cannot meet?
I want to leave my display with a good amount of negative space and room for my SPS to grow. I'll have about 40# of Pukani in a 105g. My sand beds usually are 1" or less and siphoned weekly, so there is not much anaerobic filtration happening there.
I was looking in to keeping rock in my sump for added filtration. After watching this (Which rock has the most surface area? - YouTube) I found that Marine Pure was more cost effective, but then I found out about the aluminum...
[Not sure if this if this helps, but other filtration on this tank is going to be a large skimmer (5x oversized to start, may add more depending on bioload), spinning chaeto refugium, GAC, and possibly LaCl3 and vodka depending on if they are needed.]
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