To ensure that your fish tank is running well and your fish are in good health, you need to have all of the following aquarium equipment:Aquarium filtersThe main job of aquarium filters is to keep the water clean by correcting unwanted changes to the tank’s water conditions such as physical debris (dirt, fish waste, uneaten food), toxins from decomposition of organic matter like dead fish and plants, and undesired chemicals from additives and medicines. The type of filter you will need will greatly depend on the size of your aquarium, the type of fish you have, and how large their population is. A complete filtration system needs to have all stages of filtration - mechanical, chemical, and biological.Aquarium lightsAquarium lights are also important aquarium equipment. To avoid fish stress, poor growth, discoloration, and other ailments, you need to have sufficient lighting that replicates the light conditions in the fish’s natural habitat. As your aquarium will most probably be placed indoors, you can give your fish days and nights by controlling the lights. If you have live plants, aquarium lights will also help in making them grow healthy.Heating equipmentTo provide your fish with the temperature that is ideal to them, you have to install an aquarium heater. They usually come in two types: submersible heaters and heaters that you have to place inside your power filter or canister filter. Fish cannot produce their own body heat and are, thus, susceptible to illness when the temperature fluctuates during the day. Keep in mind that most aquarium fish come from the tropics so the water should normally be above room temperature.ThermometerAn aquarium thermometer is one of the cheapest but indispensable aquarium equipment. They are your gauge if your heater is working properly. As the temperature fluctuates depending on the time of the day and the season of the year, your thermometer will help constantly check the temperature so it can be adjusted to an optimum level according to the fish tank’s requirements.Air pump for fish tanksAn air pump basically provides aeration inside your tank. This piece of aquarium equipment is needed since it increases water circulation to promote proper gas exchange. An air pump is also used to power aquarium equipment such as some types of filters and protein skimmers.Aquarium ornamentsFish tank decorations serve both aesthetic and practical functions. Plants, driftwood, rocks, and corals can make the underwater scene of your aquarium look natural. If you want to create a scene, you can decorate the aquarium with wreck ornaments, ruins, treasure ornaments, and even some decoration that you can light up from within. Practical uses of decorations include giving the fish a resting place and hiding other aquarium equipment.In the case of aquarium plants, you have a choice between real and plastic. Most people prefer plastic plants since they don’t die and add to organic pollution. Live plants are also prone to being eaten and uprooted by the fish.