Assorted GMO / Glo Tetra

Assorted GMO / Glo Tetra (Gymnocorymbus ternetzi) Care Guide

Also known as GloFish® Tetra or Fluorescent Tetra

The Assorted GMO / Glo Tetra is a vibrant, peaceful schooling fish that glows in brilliant colors like cosmic blue, electric green, and fiery orange. Derived from the Black Skirt Tetra, these fish are genetically modified to naturally express fluorescent colors that shine under blue LED lighting — adding dazzling energy to any aquarium.

Tank Requirements

• Minimum Tank Size: 60 litres

• Temperature: 22–28°C

• pH: 6.0–7.5

• GH: 4–10

• KH: 2–8

• TDS: 100–250 ppm

They prefer clean, stable water with gentle flow and moderate lighting. A dark substrate and blue accent lighting enhance their glowing appearance.

Habitat Setup

Recreate their natural schooling behavior with:

• Live plants for cover

• Open swimming areas in the mid-water zone

• Smooth rocks and driftwood for structure

Always keep them in groups of 8 or more — this reduces stress and keeps their social behavior balanced.

️ Feeding

Glo Tetras are omnivorous and enjoy a mixed diet:

• High-quality flakes or micro pellets

• Frozen or live foods (daphnia, brine shrimp, bloodworms)

• Vegetable-based foods for color enhancement

Feed small portions twice daily, avoiding excess waste.

Tank Mates

Peaceful and active, these tetras make excellent community fish.

Ideal companions:
Neon Tetras, Corydoras, Rasboras, Guppies, small Gouramis, and peaceful shrimp.

⚠️ Behavioral Note:
If not kept in schools of 8 or more, Glo Tetras can become fin-nippy or mildly aggressive toward other fish. In proper groups, they feel secure and any chasing or nipping is limited to their own school — a natural part of their social interaction.

Breeding

Breeding behavior mirrors that of the Black Skirt Tetra. They scatter eggs among fine plants; remove adults afterward to protect the eggs. Offspring naturally inherit their fluorescent coloration.

Interesting Fact

The fluorescent colors of Glo Tetras come from bioluminescent genes originally used in scientific research — they glow naturally for life and pass their colors on genetically, not through dyeing or painting!

Reference: Bubbly Fish – Creating underwater wonders