Iguanodectes Geisleri

Datasheet

General Description

Iguanodectes Geisleri, commonly known as the Red Line Lizard Tetra, is a peaceful fish often found in the well-researched community aquarium. It is recommended to keep them with similarly-sized characids, gasteropelecids, and other compatible species to create a harmonious environment. These tetras exhibit interesting behaviors, especially during interactions between rival males competing for female attention or hierarchy within the group.

Aquarium Setup

An ideal tank setup for I. Geisleri includes a sandy substrate, driftwood roots, and branches for naturalistic decor. Adding dried leaf litter can provide cover, promote microbe colonies, and offer additional food sources. Maintaining stable water conditions with pH levels ranging from 5.0 to 7.0, hardness of 18-90ppm, and a temperature between 20-26°C (see table) is crucial for the well-being of these sensitive fish.

Behaviour

These tetras are generally peaceful and thrive in groups of 8-10 individuals. They display vibrant colors, particularly during competitive or hierarchical displays among males. To prevent excessive harassment, it is advised to keep more females than males in the group. Mixing I. Geisleri with other schooling fish enhances their sense of security and creates a visually appealing spectacle in the aquarium.

Feeding and Diet

Being omnivorous, Red Line Lizard Tetras feed on small invertebrates, crustaceans, algae, and fallen fruits in their natural habitat. In captivity, they can be sustained on dried foods but thrive on a varied diet that includes live and frozen options such as bloodworms, mosquito larvae, Daphnia, and Moina. Providing a diverse diet ensures optimal nutrition and overall health for these tetras.

Reproduction & Dimorphism

Adult male I. Geisleri exhibit distinct red markings on their pectoral, pelvic, anal, and caudal fins, which are absent in females. During reproduction, males intensify their colors to attract females. Successful breeding can be encouraged by creating a conducive environment with ample hiding spots for spawning and ensuring proper water parameters conducive to breeding behavior.

Habitat and Distribution

These tetras are native to the rios Madeira and Negro in the Brazilian Amazon basin and the upper Río Orinoco system in Venezuela. They prefer smaller tributary channels with flowing blackwater that is acidic, soft, and stained brownish due to organic matter. I. Geisleri is also associated with morichals in the Orinoco system, characterized by clear water and sandy substrates with abundant aquatic vegetation. In the Marmelos Conservation Area, they coexist with various fish species in their natural habitat.