The Bubble Magus QQ3 Skimmer is a high-quality external protein skimmer designed for marine aquariums with a tank capacity of up to 300 litres. Manufactured by Bubble Magus, this hang-on filter is specifically tailored for removing excess proteins and waste from the water to promote a healthier environment for fish and other aquatic animals. The skimmer's size and location make it easy to install and maintain, providing efficient filtration for a clean and clear aquatic habitat.