Hi Predatorkeeper87 yes but a lot of thought and planning goes into any modification in my tank, as you see it has a glass top cut in two pieces, with holes on each side, so i have to modify the piping system full if I gotta fit another filter, OR can I REPLACE with a larger capacity filter, the present one is 1200 litres per hour...any idea how muh capacity is right for my 300 gallons (990 litres) tank?