The Swiftech, the double Procore, the Eheim and ditch the tank to save money. The Polarflo haven't been shown to perform as well as the Swiftech as far as I know, the double Procore definitely performs better than the BIX2, and the Eheim 1250 is a proven pump where the C-Systems pump hasn't been around for that long. If you can even get one. The Eheim is more powerful anyway. The tank is purely for looks and easy filling and bleeding. It doesn't help your temps at all. Save your money and skip it.
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