It isn't at all. I have a 2217 (with a 2215 impeller) on a Mr. Aqua 11.5 gallon rimless tank with a lilly pipe outflow. The biggest tank I have a 2217 on is a 30 gallon. I used a spray bar attachment. It seemed to produce better outflow and even then I use a couple Marineland power heads with sponges on both corners. Lol.Is that not a little overkill for tanks that size?
You aren't wrong about the flow being low.It isn't at all. I have a 2217 (with a 2215 impeller) on a Mr. Aqua 11.5 gallon rimless tank with a lilly pipe outflow. The biggest tank I have a 2217 on is a 30 gallon. I used a spray bar attachment. It seemed to produce better outflow and even then I use a couple Marineland power heads with sponges on both corners. Lol.
Fact: The impellers on the 2215 and 2217 are interchangeable.