JaredL Posted February 21, 2021 Share Posted February 21, 2021 I've read from many sources that recommend you have a filter gph that is 5x your tank size in gallons. My question is: How can I achieve this and still have a slow flow tank for fish such as bettas? I've found that anytime I follow this 5x rule of gph I end up with a fairly strong current in my tank. Does this rule only apply to HOBs since they notoriously over state their actual gph? Link to comment Share on other sites More sharing options...
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