Found on of these with overflow box locally for 100. Thinking of changing out my 404 in favor of it. On their site they are rated for 600gph, which is almost double my Fluvals 340. Im also thinking I can just take my matrix out of my fluval, bag it, and drop it in the sump area of the 175 wet dry. Is this a worthwhile change? This is on my 120, where I also have a matrix filled fx5 helping out. Was thinking maybe try and get a filter sock in the wet dry somehow, and us it for mainly mechanical, and fill my fx5 with as much bio as possible.