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20 gallon hex filtration and water movement


Zitheran
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I'm using a fluval hang on back filter in my 20 gallon hex tank. This tank is approximately 20 inches deep from the top of the water to the substrate. With the flow set to max I am getting to much water movement at the top and barley any toward the bottom. I have put and extended tube for the water intake to get near the bottom. 

Should I run a small sponge filter with the hang on back filter that I have? Or should I switch to just a large sponge filter?  Or any other suggestions? 

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