I have an Oceanic- 40 gallon hexagon tank with a Penguin BIO-Wheel Power Filter (200 50 gal). I am not really happy with the Bio wheel since the wheel is no longer spinning and it also makes a lot of noise. So I decided to invest in a Canister filter. Can you please give me any suggestions on a good canister filter? I have tetras, guppies, and zebra danios. Also, is the Eheim Filter 2217 too powerful for my system?