cf, it's on the 125 gallon Asian. It is the only filter on the tank and it is still overkill; it hauls. The output current is very strong however (with dual adjustable ejection ports), so while it is ideally suited for a tank trying to recreate a current (my reticulated loaches really appreciate it), it is not well-suited for those looking for a calm tank effect. Think Class 4 rapids.
Maintenance wise, it has bulletproof construction. The hand-tightened screw down bolts are a great feature. It also has a big footprint, is heavy, and is very hard to move when filled with water (though there is a drain port, I will never use it). Keep doing those bicep curls. The media trays are monstrously large and the mechanical stages add up to miles of foam. I don't think you can get better volume of media in a single filtration unit.
Overall, I am extremely satisfied with it and would buy another unit in a heartbeat. Not the best choice for a 'lithe' individual as it will be a pain to manipulate and move for monthly filter maintenace, etc.
EDIT: Forgot to add, I love the fact that unit doesn't need to be primed. As long as 2 gallons of water are in the unit, just plug and play. This makes water changes a breeze. The unit also does a reboot once every 24 hrs. to expel any air that has accumulated in the filter; very handy feature if it happens to be located near an airstone.
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