Seriously speaking. You can watch the water motion provided by the Wavebox...you will notice that all the water in the tank is moving. The argument is that the Waveboxe just keeps everything in suspension, but that another powerhead or two is required to move the water. If the water was just seasawing in the tank I would agree. However, just watch the particals moving in the tank with just the Wavebox. You will notice that not only do they stay in suspension, but that the is also very good circular motion provided by the Wavebox alone. Now, if you have critters in your tank that require move then this...then by all means the Tunze Streams are the best! But for normal water motion and circulation the Wavebox is all you need.