GloFish® Pristella Care Guide - Aquarium Setup, Diet & Breeding

GloFish® Pristella have the compact, translucent-silver body of the X-ray tetra, with dark markings and yellow and red accents in the fins. Their fluorescent coloration comes from an introduced fluorescent protein gene rather than conventional surface pigmentation, giving them a vivid glow under suitable blue or actinic aquarium lighting. Under ordinary white lighting, they still retain the elegant, lightly transparent appearance associated with Pristella maxillaris.

These active but peaceful tetras spend much of their time in the middle and upper areas of the aquarium. They are social fish that look most natural when moving together in a group, often forming a loose shoal that shifts direction quickly when startled or excited. Their modest adult size makes them a popular choice for community aquariums.

In the wild, Pristella maxillaris inhabit a range of slow-moving and seasonal waters, including clear streams, flooded areas and vegetated margins. They are adaptable fish, and their ability to tolerate changing conditions is reflected in the hardiness of many aquarium-kept specimens.

The GloFish® form was developed from Pristella maxillaris for its fluorescent appearance. It retains the species’ generally peaceful nature and active schooling behaviour, making it an eye-catching variation of a familiar South American tetra rather than a fundamentally different type of fish.

GloFish® Pristella is a fluorescent genetically modified form of Pristella maxillaris, a small characin native to northern and central South America. The underlying species occurs in the Amazon and Orinoco drainage regions, as well as coastal waterways of countries including Brazil, Venezuela and Guyana.

A group should have at least a 75-litre aquarium, with a footprint of around 60 × 30 cm or larger; a longer tank is preferable because these active fish use open swimming space. Use a secure lid, gentle to moderate filtration and areas of dense planting around the edges, while leaving an unobstructed central swimming area. Dark sand or fine gravel helps their colours stand out, and driftwood, smooth stones and subdued areas provide visual shelter without overcrowding the aquarium.

Adults reach approximately 4.5 cm (1.8 in) in length. Females are usually slightly larger and deeper-bodied than males, while males tend to remain slimmer.

Offer GloFish® Pristella a varied diet of quality small flakes or micro-pellets, supplemented with frozen or live foods such as brine shrimp, daphnia, mosquito larvae and finely chopped bloodworms. Their small mouths suit appropriately sized foods, and variety helps support colour, condition and vitality. Feed only what the group can consume promptly, with smaller portions given regularly rather than a large amount at once.

GloFish® Pristella are peaceful community fish and can be kept with other similarly sized, non-aggressive species such as neon and cardinal tetras, harlequin rasboras, small danios, cherry barbs, honey gouramis, kuhli loaches and small Corydoras. Avoid large predatory fish, boisterous cichlids and fin-nipping species, which may harass or eat them. They should also not be housed with aggressive or highly territorial tankmates that prevent them from schooling openly.

GloFish® Pristella breed in the same general manner as Pristella maxillaris: they are egg scatterers that release eggs among fine-leaved plants or spawning mops. A separate breeding aquarium with clean, slightly soft water and subdued lighting can encourage spawning, while a mesh or marbles can protect eggs from hungry adults. Remove the adults after spawning, and feed the free-swimming fry suitably sized foods such as infusoria before progressing to baby brine shrimp. Fluorescent offspring should not be assumed, and breeding or transferring genetically modified fish may be subject to local rules and the manufacturer’s terms.

Females are generally fuller through the body, particularly when carrying eggs, and may be slightly longer than males. Males are usually more slender, with less pronounced body depth; the difference can be subtle in young fish.