I have a 10g FOWLR. I currently have a SSB, prolly about 2 inches or so with (I think) 20lb of Tahitian Moon sand. If I were to add another 20 pounds of it - that could prolly allot me a DSB there for allowing for some anaerobic life. Is it worth it in a 10g? Can I even do it now? Would it work? Would my Nassarius snails disturb it?