Magnetic aquarium cleaners are a great way to keep your tank clean without the hassle of having to manually scrub and scrape away algae. They work by using two magnets, one inside the aquarium and one outside that work together to create suction. This suction is strong enough to pull off any dirt or debris that has built up on the surfaces of your tank, making it much easier for you to maintain a clean environment for your fish. The magnets also help prevent buildup from occurring in first place, as they reduce the amount of food particles left behind after feeding time. Magnetic aquarium cleaners can be used with both freshwater and saltwater tanks, however many users prefer them more in saltwater setups due to their ability to easily remove calcium deposits from equipment such as heaters and pumps – something which manual cleaning simply cannot achieve. Overall these handy devices can save you time while keeping your tank looking its best - an absolute must-have for anyone serious about their aquatic hobby!