
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.

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