Why not just purchase a less powerful pump for the biocube? The stock pump is rated at 137 gph so anything lower than that should still be fine for the tank. Or, if Blue likes some flow try out the Hydor Flow Deflector
? All it does is rotate using pressure created by the pump and creates flow all through out the tank. If that doesn't work you could also try DIY a spray bar across the back of the display to spread out the flow. Hope you find something that will please your Blue.