Jebao SOW-20 Wave Maker Flow Pump with Controller for Saltwater Marine Reef Aquarium - Powerful Water Circulation for Coral Tanks & Fish Tanks

Update: June 2021:Both my SOW-4 units are still working fine. They are perfectly silent. No issues. I run one at 3 blue dots and other at 4 blue dots, because any more and they become too powerful for my 75 gallon freshwater DT with 9 Discus fish in it. I am ordering a SOW-3 today for moving media sump.Old review:I bought their SOW-8 version for my 60 gallon tall freshwater tank. It needs a wavemaker because of the tall design,water gets pretty stagnant and algae grows. SOW-8 is way, WAY too powerful. It uprooted plants, water almost blew over the tank edge if I pointed in the wrong direction. Even at the slowest setting SOW-8 is too much. I am returning SOW-8 and got a SOW-4. That works perfectly.BTW, the SOW-8 was very silent. I also tested the wireless pairing feature between the SOW-8 and SOW-4. Works perfectly. My only gripe is that the light sensor is built into the controller. It should be on a wire instead. This way, I have to keep the controller out where light from my LED can fall on it.Everything is controllable, speed, wavemaking pulses, night time speed is controllable separately.......night time disables fancy stuff.....just simple steady stream. I love these!