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Use a aqua clear on the tank, no media in it just a sponge, everything else is in the sump. Is this thing just putting nutrients in the water. Should I take it off. I clean the sponge about every 9 to ten days.
If the sponge that you clean is getting dirty then I say leave it be. It must be catching particulate matter thats in the water and getting that outta the tank is good.