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Do I need more waterflow?

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Right now in my 120gal I have one Cascade 1200 and two powerheads. I am debating if I should add one of those Rena filters that is on sale and get rid of the powerheads, or keep them in there also. What do you guys think? If I added a Rena I could do an inline CO2 reactor and remove some more equipment from my tank.