Marineland Penguin Power Filter Certified flow rate of 350GPH, perfect for aquariums up to 70-gallon Whether you're a first-time aquarist or consider yourself a hobbyist the Marineland Penguin Power. Filter is right for you. Because it comes in four different sizes. This filter is perfect for any small to medium aquarium 20-70 gallons. It does a superior job with the bio-load of Tropical Community Fish Oscars and African Cichlids. Leftover food & fish waste particles disappear in minutes due to the filter's replaceable Rite Size.