I have the 65 and maintaining a consistent water level is crucial for it to work. In reality it probably only works for a bout half a day at a time, right after I top up. If you have it installed in a sump, or have an auto top off, then it should work better.
I've still been fairly happy with my 65, it's on a 20gal tank, with only a clown, and yellow tail damsel, and it's able to keep up with that bioload fairly well.
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