New Fish Tank Tips: If you enjoy reading, go to the library or buy tropical fish books. Get a couple of books on aquarium information or the species you are interested in getting. Reading a book is probably the fastest way to get up to speed and it provides a great reference for the future. On this site you can find some of the fish books we’ve reviewed.
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The green terror (Aequidens rivulatus) is a colorful freshwater fish in the cichlid family. The fish originate on the Pacific side of South America in the coastal waters from the Tumbes River in Peru to the Esmeraldas River in Ecuador. Males reach lengths of 30 cm (12 in.) and females can, too. However, females stop growing the first time that they spawn and will remain at that length for the rest of their life. Females are sexually mature at around 4.5 in., and therefore that is the smallest length that they can remain at. This causes a misconception that males are larger than females.
The fish is somewhat deep-bodied with a prominent head. Adult males develop a pronounced forehead hump, a common cichlid trait. Juveniles are tan colored with silver-blue flecks and lack the bright iridescent blue, green, and orange coloration and long, flowing fins of adult specimens.
Green terrors natively live in a tropical climate and prefer water with a 6.5–8.0 pH, a water hardness of 25.0 dGH, and a temperature range of 20–24 °C (79–86 °F).
Green Terror Cichlids can be successfully bred around 3 inches.