Well, back to the original question I have two on a 120 gallon 5 foot tank and I think they are great so far. I did get the adjustable power source but have not used it yet. I have the original power source hooked up on low and they are very powerful. I have been very happy with my purchase so far. They have been running for a month in the new tank. Can be a bit loud on random or wave but I don't really have anything to compare them too other than the small Koralia evo 750's. More power than I would ever need.
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