The severum, Heros severus [...], is a freshwater tropical cichlid native to the Amazon region in South America. [...]
As an aquarium fish, the severum is a relatively mild-tempered cichlid, although aggression is not uncommon. It grows to a length of 6-12 inches, is omnivorous, but will benefit from vegetable matter in its diet. Courgette, peas, and lettuce will be eaten with relish, as will commercially available herbivore foods. If sufficient green-matter is not included in its diet, it may eat aquarium plants. [...] Heros severus lays their clutch of eggs on a horizontal surface [...]. This is usually on a flat piece of slate, driftwood, or a round rock. The parents will tend to the eggs very carefully, eating the dead ones, and aerating the live eggs.
In general, this is a hardy and robust fish with lots of character. However, it does require a fairly large aquarium, with the usual neotropical cichlid requirements of good biological filtration and sound husbandry. Decor is not generally important, but the fish can be shy without some hiding places to retreat to, and care should be taken to ensure any rocks included do not harden the water too much as the fish originates from soft acidic water.
When they say "fairly large aquarium", they mean over 4ft in length.
