I am never a fan of single pump set ups, the main reasons being 2 pumps always means you have back up if one fails, and whenever the flow just comes from one direction you will have unbalanced growth, a windswept look, and you will also tend to have a corner or some spot detritus accumulates unless you can alternate the flow direction. One pump would be enough flow, but I wouldn't feel it is a good way to do things. The Stream 3 would work, I really like them for tanks 6ft and up. You do have a place behind rock to conceal them I have some reservation about the bubble tip, you would want to use the foam protection on the pumps for sure and they need cleaning. I think all things considered, unless you plan to get into SPS heavily, I would do 2 6095's, they are much smaller and easier to conceal and would not be too much flow, though you can of course run the 6150's very slow, they are a bigger pump and you don't really need so much pump.