I have a 50 gal with about 60-70 lbs live rock, a cucumber, a few snails & crabs, 3 clowns, watchman goby, yellow tang, flame angel, mandarinfish and a grouper along with a clam, some corals, polyps etc... I am upgrading to a 210 gal. I will be moving the filter (a fluval fx5) from the 50 gal...