They can be completely submerged under the water. Submersible heat by direct contact with the water. This can make them difficult to place in the tank because they must be placed with their tops out of the water. They cannot be completely submerged under the water. They are usually the cheapest option for heating an aquarium. Immersible heaters heat by direct contact with the water. Aquarium heaters come in several different types. With heaters, it is better to get one that is too big than to get one that is too small. If you have a very large aquarium you may need to use two heaters. The general rule is 25 watts for every 5 gallons (19 liters) of water in the aquarium. When purchasing a heater, make sure you get one that is made for the size of the aquarium you have. Aquarium heaters can be purchased at local pet shops and specialty aquarium stores. Heaters must be used to maintain the temperature of an aquarium during the winter or in cold climates. If you are looking planning to keep invertebrates and corals in your aquarium then an RO/DI filtration unit is definitely a highly recommended piece of equipment. Filters must be replaces periodically but can usually be found online at significantly reduced prices. RO/DI units can also be purchased with built-in Total Dissolved Solids (TDS) meters to provide a digital readout of water quality at each stage of the filtration process.
All though they do require an initial upfront investment, they are and much more convenient cheaper in the long run than buying bottles water or purchasing premixed water from an aquarium store. RO/DU units can provide extremely pure water. The water also passes through a number of canister filters including a deionizer (DI).
RO/DI filters consist of a membrane that filters the water through a process known as reverse osmosis (RO). The quality of tap water in most metropolitan areas is not good enough for use in marine reef aquariums containing delicate corals and invertebrates. Water quality is a major concern for the marine aquarium hobbyist.
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