Aquarium heater

An aquarium heater is a device used in the fishkeeping hobby to warm the temperature of water in aquariums.^[1] Most tropical freshwater and marine aquariums are maintained at temperatures that range from 22 to 30 °C (72 to 86 °F).^[1]^[2]^[3] The types include glass immersion heaters and undergravel heating. There are also heating mats that may be placed under the aquarium.^[4]

^ ^a ^b Riehl, Rüdiger. Editor.; Baensch, HA (1996). Aquarium Atlas (5th ed.). Germany: Tetra Press. ISBN 3-88244-050-3. {{cite book}}: |first= has generic name (help)
^ Sands D (1994) A fishkeepers guide to Central American cichlids. Tetra Press. Belgium pg 59-60.
^ Mills D (1993) Aquarium Fish Harper Collins ISBN 0-7322-5012-9
^ Cite error: The named reference Sanford was invoked but never defined (see the help page).

[baensch-1] Riehl, Rüdiger. Editor.; Baensch, HA (1996). Aquarium Atlas (5th ed.). Germany: Tetra Press. ISBN 3-88244-050-3. {{cite book}}: |first= has generic name (help)

[FKGCC-2] Sands D (1994) A fishkeepers guide to Central American cichlids. Tetra Press. Belgium pg 59-60.

[3] Mills D (1993) Aquarium Fish Harper Collins ISBN 0-7322-5012-9

[Sanford-4] Cite error: The named reference Sanford was invoked but never defined (see the help page).

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