I don't understand why you would make this comment and not provide the reasoning behind it.
to the OP, id say start with one and go from there. we are talking about a powerhead that moves 3,000gph. and although its true that o matter the flow, a fixed current pattern will cause dead spots, but that's where the jabeos controller comes into play. this unit will make waves in your tank that you wont believe. and honestly ive had a wp40 for about 2 months and I love it. plan on buying another.
and don't buy 2 wp25's... theres roughly a $5-$8 price difference between the wp25's and wp40's....go with the 40