They thrive best in a densely planted aquarium, with a dark substrate and floating plants that dimm the light. At least one should give them an aquarium of about 60x40x40 centimeters or 80 to 90 liters. Aquariumĭespite their small size, this is a very active fish and, as stated earlier, it is not really suitable for small aquariums. In the aquarium they can best be combined with somewhat similar species such as Danios, small barbels, other small tetras or small catfish (Corydoras sp.). It is better not to keep them together with very vulnerable fish or fish with long veil-like fins, they can also start nibbling fins when kept in a too small an aquarium. Blue tetras can show some intraspecific aggression, especially if they are kept in too small aquariums. Just like most other small tetras, it is a real schooling fish, they must be kept in groups of at least five specimens (preferably 8 to 10 or more). Only then they will show their natural behavior. It is a very lively fish that really needs a slightly larger aquarium than most fish of a similar size. Adult males are a bit more intense in color than females and their anal fin is more reddish in color during the mating season. Adult females are slightly larger and have a clearly rounder belly than males. The Blue Peru Tetra does not get large: the maximum length is around 5 centimeters. The blue color of these fish is often so intense that many people think that the color is artificial, which is not the case. The tail is divided in two by a black stripe or spot. A blue band runs over the sides from the gill cover to the caudal fin. Their basic color is blue green to glossy blue, the back is greenish with dark edged scales.
The dorsal fin starts slightly behind the center of the body, the caudal fin is clearly split. The body is elongated and laterally compressed, the eyes are relatively large in relation to the head. That is in the north of Peru, not far from the borders with Brazil and Columbia.They live in densely planted, oxygen-rich water, in rivers and streams. Knodus borki lives in the wild in Peru, and is mainly found in the Iquitos region. Based on differences in teeth, shape of the lateral line and color pattern, he established that it was a different species than Boehlkea fredcochui, which he also described in the same article.
All this was established in 2008 by German ichthyologist Axel Zarske. The fish offered commercially (which are fairly rare in the hobby) are Knodus borki. The description elsewhere in this database of the Boehlkea fredcochui is therefore not correct. In fact, as far as I can tell, the “real” Boehlkea fredcochui is not kept in aquariums. However, the fish offered under that name are rarely if ever Boehlkea fredcochui, that is another fish that shows some similarity with the blue (Peru) tetra. Name confusion: The name “blue tetra” can be confusing because several fish, especially Boehlkea fredcochui, are often called this in the trade and the hobby, while in some places even Paracheirodon simulans are referred to by that name. Their common name is Blue Tetra or Blue Peru Tetra. Knodus comes from the Greek “knodon” = knife, sword, while “borki” refers to the German aquarist Dieter Bork. Knodus borki was officially described in 2008 by Zarske.
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