So I ordered two of these pumps for my 40 gallon reef. They work together wirelessly and seamlessly. Just press one button at a time and they combine to create beautiful waves. You are incredibly strong. I had to turn one off and the other only runs at 2/10 power (a 3ft long tank). I will be keeping both as I am restoring 125 gallons and they will be perfect for this. If you have anything under 55 gallons I would say go for less than that.
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