So for my new 20 gallon saltwater tank, I'm using a 50 gallon hang on the back filter, and I really need to increase my water flow, but I was wondering what kind of a wavemaker do I need?  How many GPH would you suggest? I've been looking at several, and all I need to decide is how much flow I need. I figure I should just get one with a huge flow and then I could just lower it. Please let me know what you think.  Any advice from past experience is much appreciated.  Thanks. (:

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20x gallon size for reef 450gph
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