I run a 2028 on my 40 breeder (36x18x16). It has a flow rating of 277 gph and the 2217 has a flow rating of 264 gph. These are basically the same, but my 2028 has a 5/8" output and the 2217 has an 1/2" output. I have plenty of flow. My current flows in a counterclockwise direction. I am using Eheim's optional installation kits 1 and 2 which came with it. They are mounted on the left side. I added an extra section to the spray bar so that it would reach all the way across. This added several more holes for the water to flow out of. It still has good flow. Below is a picture of how I set it up. I have mine flowing through an UV and a Hydor heater. I also have it flowing through a pump for CO2 misting, but when I turn the pump off, there is hardly any difference in the flow. If you set your intake and spray bar like mine, you can install a tiny powerhead, like a Rio 50
, on the back of the right side so that it is blowing towards the left side. This adds a little extra flow for cheap, but it is not really needed.