For flow or return? There is a new configurator feature that allows you type in your aquarium size and get back recommendations. It is on tunze.com. On page 6 of the catalog which you can download there are general recommendations of pump type for the type of habitat. For the various return pumps there are flow vs head charts for each seperate model. Most are in meters of head vs meters cubed of flow which can be awkward as most of us think in liters or gallons.
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