The powerheads we were using, two Tunze nanostream 6045’s, provided a single flow rate in the direction you pointed them. My husband was constantly repositioning them to try to get a better flow. It seemed that everything in the tank was getting blasted relentlessly, or getting no flow at all.
After much consideration (due to the price) we decided to bite the bullet and purchase the Ecotech Marine MP10 wireless powerheads. We started with one used one, and within a week found another one. This really helped with the price as they usually run $285.00 each brand new.
The best feature of these powerheads is that they work together wirelessly to vary the flow rate in the tank. There are several modes that can be programmed allowing the powerheads to alternate speeds, surges, and pulses that ultimately allow for a more random flow.
We have found that we can actually create waves in our tank with these two little powerheads! The flow path is much wider than with the Tunze’s, and the flow looks and acts very natural.
Also, they create an undertow, which helps to keep detritus off the sandbed and help push it up to the overflow, where it can be removed and filtered out. On this note, there is a “Nutrient Transport” mode just for this purpose. Here is a great link explaining the difference between each mode and their benefits.
Some other great features is that these powerheads take up less space inside the tank in comparison to other powerheads. Also, the motor is on the outside of the glass which means less heat transfer to the tank.
There is mostly rave reviews about these powerheads. The main complaint is the price of course, but the other complaint is the noise. Some people are saying they are quite loud in comparison to other powerheads they have owned. Out of the two we have, one is dead quiet, and one is a little noisy off and on. We think the bearings in the motor may need to be replaced sometime in the future. That being said, they are more noisy than the Tunze’s, but I would not call them loud in any way. I am willing to put up with a little noise for performance.
Our corals seem to be benefiting from the varying flow; they aren’t constantly being battered, and look better than they have been recently.
So, aside from the price, we love them, and our corals seem to as well!