I have the 14 gallon Biocube. Will be using aragonite sand. I have the stock pump that came with the cube. And also a power sweep 125gph rotating powerhead off ebay. Is this goin to be enough for water flow. I am setting up my cube to be a coral tank. Maybe I can get a stronger return pump. Dont the water flow need to be irradict? Should water flow be flowing against each other? Do I need a 125gph return pump to replace the stock water pump? I will use about 12 pounds of LR and have it setup in the U postion. Ive done alot of research on this topic. Everyone has different opinions. Any expert advice or biocube owners?