Review on UPETTOOLS Aquarium Circulation Powerhead Wavemaker Pump: Efficient Submersible Fish Tank Pump - Delivering Optimal Water Flow with Adjustable Suction Cups by Melissa Marie

There is no way to control the performance of these devices. I saw someone say they use a voltage regulator and might have some control. Sorry, but that doesn't work. It's either on full power or off. I have a sandless saltwater aquarium and it blows everything away like a hurricane. If I had sand in the tank, it would carry the sand everywhere. I had to spend my money on a jeboa wave generator. I think I'll use it to mix salt water.