If we are talking a tube for the solo, similar to a HT for the Cloud, then yeah, smaller would be better for sure. If we are talking about a tank of a piece meant to be used at home, on the desk or table, the 11-12" height would be good IMO, I base this on having a 12" piece now, that I don't have to crouch or stretch to use, only problem with it, is my Cloud is huge and makes it off balance when I use them together, not at all safe enough to let go of the Cloud. So a bulkier, sturdy based piece is what I am after. I am guessing that PV is making more than one here... one is the Fbomb ( like a HT for the Solo or similar) and one is the FC bubbler?? or did I get confused somewhere?