I don't think there is such a thing, but let me know if I am going overboard. I have a 180 with an FX5 and Wet/dry filter (rated for 175). I was thinking about adding an AC110. Unnecessary? In terms of fish I have a JD, GT, Mayan, Clown Knife, catfish and clown loach. The cichlids are 5"-7" and the CK is about 12".