01-26-2008, 10:33 AM
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My 75 gallon is filtered roughly 15 times an hour...according to the ideal conditions of the filters. Most filters do not come close to their maximum GPH in a realistic aquarium set-up. But for me, I do not think it has to do with the numbers of how many GPH, and how many times your tank is turned over. I think it more so depends on how the water flow is and how it treats your fish. If you see your fish having difficulty swimming a certain direction, or is trying to rest and it constantly being caught in the current, then those are signs that you are over filtering. By simply adjusting the flow rate, you can decrease the speed of the current, yet still use each filter's full biological + mechanical abilities. In my opinion it is a much better alternative than getting rid of a filter all together to reduce the water movement.
I'm all about having multiple filters, I have 3 power and 1 canister on my 75 gallon, and having multiple ones really comes in handy for starting new tanks, and the amount of nitrifying bacteria is only increased. Same principle for heaters too, good to have more than one in case one fails, or you need to set up a hospital tank quickly.
And when you find yourself having trouble locating a new spot for a filter, or if you need a second power strip, then you know you are over-filtering.