Hi. I have a Fluval Flex 9 gal for my betta fish. It's currently being cycled, and I have a pre-filter sponge on the output pump nozzle to reduce the flow of water. This has significantly reduced the flow, which is great, but does it also reduce the pump output? The fluval site says the flex 9gal should have an output of 61 GPH. I plan on giving my betta a few tank mates, but I want to make sure my filter is turning over the water enough before I add. Thanks!