Aqua One NanoSkim Protein Filter 90. These filters are 7.7 watts with a maximum flow rate of 480L/hr. Suitable for use in a fish tank up to 90 litres. This skimmer filter can be used in a marine aquarium or coral reef tank. Includes a limewood airstone, and a carbon cartridge which acts as a secondary chemical filter as well as providing mechanical filtration. This protein skimmer requires little power to operate, however is designed to effectively and easily filter waste from your aquarium.