Purchased this yest on craigslist for $300.... 130 -135 Gallon d.a.s aquarium. I really like the aquarium except for the load of scratches on the inside of the glass ... ima try some cerium oxide but thats a whole other topic lol...:OT:.... I have never seen an aquarium with an internal filter like this and cant figure out how it should be assembled and operated. I was really hoping this was an overflow box because i want to do a wet/dry with a refugium but i think its just a filter. Any info you can provide about this filter as far as how well they work or how to assemble it would be greatly appreciated. Thanks in advance.