Weighted base Easy to assemble Simple to maintain Hollow centre allows carbon to be added Safe to be used with baby fish of any size Can be operated with an air pump or water pump Spare Parts: 25064S - Filter Air 30 Sponge Replacement 64s 25065S - Filter Air 60 Sponge Replacement 65s 25066S - Filter Air 136 Sponge Replacement 66s Available in different sizes: 19884 - FilterAir 30 Air Filter 8.5wx19hx8.5cm D 19885 - FilterAir 60 Air Filter 8.5wx24hx8.5cm D 19886 - FilterAir 136 Air Filter 12wx24hx12cm D Suitable for: Coldwater & Tropical