I currently have an MP40 on each end of my 4 foot mixed reef tank. Have quite a few acro frags and am looking to get some more flow, including increased surface agitation. Considering two Tunze powerheads for the back wall of the tank. These look like good options since you can point them upward or wherever you would like the flow. Anyone out there have a specific model of Tunze they would recommend? I am also open to other brands if people have different suggestions.