I bought this for a 65 gallon reef tank. It works well. The controls need tweaking, but my tank is 4ft long and I no longer need to use the 3 circulation fans I had. It also runs on low power, so I imagine it would work well with a big, long tank. There was still a dead zone at the back end of the tank that I needed a small fan for because the RPM increase was too much for the corals. But overall it's a pretty good circulation pump.
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