Join Date: Jul 2014
Location: Swamps of Texas
My understanding, the flow depends on the type of fish. Bettahs are slow water fish, while the barbs like current. Otherwise, you want enough circulation to get the detritus to the filter inlet and not have a big pile sitting in a corner waiting for the next water change.
Amount of flow is subjective.
If the filter came with the tank, it is probably rated for the 10 gallon. Having said that, different manufacturers rate filters differently. What brand name is it? Tetra?