Max Size: 5.5cm

Red Line Lizard Tetra (Iguanodectes geisleri)

The Red Line Lizard Tetras are a scarce, peaceful, enjoyable, medium-sized freshwater fish that grows up to 9cm long. They are slow-moving and appear to swim against the current in slow motion. Their slim bodies seem to wiggle as they swim against the current of the water. They will offer an excellent addition to a community aquarium.

Red Line Lizard Tetras have three longitudinal bands on the flank starting at the end of the operculum, 1 is a red-pink colour, the other is a yellowish colour, and the other is a dark almost black, decreasing and ending below the adipose fin. They also have two red spots in the caudal peduncle over a large black patch, both of which extend halfway into the caudal fin. Their dorsal, pectoral, pelvic, caudal and anal have an intense yellow-gold colour that fades out towards the ends of the fins. Their body colours seem to change a lot, from a light beige to a bright green.

Quick Facts
Scientific NameIguanodectes geisleri
Other NamesThree-banded lizard tetra
OriginsBrazil, Venezuela
Aquarium LevelMiddle - Top
Best kept asGroups 6+
Lifespan5 - 6 years
Water Parameters
Water TypeFreshwater
PH5 - 7
GH2 - 10
73 - 80℉
22.8 - 26.7℃

Photos of the Red Line Lizard Tetra

Red Line Lizard Tetra
Red Line Lizard Tetra

Natural Habitat

Unfortunately, there is also little information about this species due to the scarcity, but the Red Line Lizard Tetra supposedly inhabits fast-flowing tributaries with thick, riparian, overhanging vegetation and substrate covered in, tree roots, leaf litter and fallen branches in the Rios Madeira and Rio Negro Rivers within the Brazilan Amazon basin, and upper Rio Orinoco system in Venezuela in South America.

The water is typically acidic and stained a brownish colour due to decomposing organic matter.

Rio Negro

What to feed the Red Line Lizard Tetra

The Red line Lizard Tetra will require a balanced diet of flakes and granules as well as live and frozen foods such as mosquito larvae, daphnia, Moina and bloodworm to maintain their health and colour.

How to sex the Red Line Lizard Tetra

It is relatively easy to determine males from females. Adult males can be easily recognised as they display red markings in the pectoral, pelvic, caudal and anal fins which are lacking in females.

How to breed the Red Line Lizard Tetra

Unfortunately little is known about breeding this species as they are sporadic in the home aquarium.

Other Tetras of interest

African Moon Tetra(Bathyaethiops caudomaculatus)
African Red Eyed Tetra(Arnoldichthys spilopterus)
Black Darter Tetra(Poecilocharax weitzmani)
Black Line Tetra(Hyphessobrycon scholzei)
Black Neon Tetra(Hyphessobrycon herbertaxelrodi)
Black Phantom Tetra(Hyphessobrycon megalopterus)
View all Tetras
Date Added: 31/08/2020 - Updated: 02/12/2021 17:35:47