Cope's Tetra Care Guide - Aquarium Setup, Diet & Breeding

Cope's Tetra is a small, lively characin with a slender, silvery body and a subtle golden or olive sheen. Depending on its mood and lighting, the flanks may show a darker lateral marking, while the fins can carry delicate yellow, orange or reddish tones. Its transparent fins and active swimming style give it an understated but attractive appearance.

This is a peaceful shoaling fish that spends much of its time in the middle and upper areas of the aquarium. In a properly sized group, individuals display more natural confidence and frequently perform short, harmless chasing displays as they establish their place within the shoal.

In the wild, Cope's Tetra inhabits slow-moving Amazonian waters, where overhanging vegetation, submerged roots and leaf litter create a mixture of open swimming spaces and shaded cover. The water is often stained by tannins and is relatively soft, although conditions can vary across its range.

Moenkhausia copei is less frequently seen in the aquarium trade than some of the larger and more brightly marked Moenkhausia species. Its appeal lies in its active behaviour, manageable adult size and compatibility with a peaceful South American community.

Cope's Tetra is native to the upper Amazon basin of South America, particularly the freshwater waterways of Peru. It occurs in calm tributaries, small streams and forest-influenced waters associated with the Amazon drainage.

A group should be given at least a 60-litre aquarium, with a footprint of roughly 60 by 30 cm rather than a tall, narrow design. Provide open swimming space, gentle water movement, subdued lighting, and dense planting around the sides and rear, with driftwood, roots or leaf litter creating shaded retreats. A dark, fine-grained substrate helps the fish show their best colour and reflects their forest-stream origins; a secure cover is advisable because active tetras may jump.

Up to 5 cm (2 in) in total length. Females are generally a little deeper-bodied and may be slightly larger than males.

Cope's Tetras are omnivorous micropredators. Offer a varied diet of quality small flakes or micro-pellets supplemented with frozen or live foods such as daphnia, mosquito larvae, baby brine shrimp and finely chopped bloodworm. Small portions fed once or twice daily help them obtain food without excessive waste, and the particles should be sized for their small mouths.

Cope's Tetras suit peaceful community aquariums and can be kept with other small tetras, pencilfish, rasboras, peaceful danios, small Corydoras and gentle dwarf cichlids such as Apistogramma. They also work well with calm loricariid catfish and other non-aggressive bottom dwellers. Avoid large predatory fish, fin-nippers and boisterous species that may intimidate or outcompete them; they should not be housed with fish large enough to swallow them.

Cope's Tetras are egg-scattering spawners that can be bred in a separate, mature breeding aquarium with soft, slightly acidic water, gentle filtration and fine-leaved plants or spawning mops. Condition a group with plenty of small live or frozen foods, then introduce selected adults. Eggs are scattered among the plants, and the adults should be removed after spawning because they may eat them. The eggs usually hatch within a day or two, with free-swimming fry needing infusoria-sized food before progressing to newly hatched brine shrimp.

Females are usually fuller through the abdomen, especially when carrying eggs, while males tend to be slimmer and somewhat more streamlined. In mature fish, males may show slightly more intense colour, but the difference is not always pronounced.