GloFish Yellow Tetra (Sunburst Orange Skirt Tetra) – ~2.5–3 inches

The GloFish Tetra is a genetically enhanced variant of the Black Skirt Tetra (Gymnocorymbus ternetzi), engineered to glow in vivid neon hues that remain vibrant throughout their life. The "yellow" variant you're referring to is officially called Sunburst Orange but often appears bright yellow to the eyes of hobbyists. 

Size

• Grows to approximately 2–2.5 inches (5–6 cm) as adults. 

Behavior & Social Needs

• Peaceful, schooling fish—they thrive when kept in groups of 6 or more, which promotes natural behavior and reduces stress. 

• Reducing signs of dominance or territorial chasing requires a larger group.>reddit hobbyist anecdote: “Once I got 2 more, they stopped with the territorial activity” 

Tank Conditions

• Tank Size: Minimum 15–20 gallons for a school, with larger setups recommended. 

• Temperature: 72–80 °F (22–27 °C). 

• pH: 6.0–7.5; hardness: Soft to moderately hard. 

• Lighting: While regular daylight lighting works, a blue or actinic LED greatly enhances fluorescence. 

• Decor Tips: Dark substrate and lush plants help their color pop—floating or red-leafed plants are perfect contrasts. 

Diet

• Omnivorous: Feed a balanced diet of tropical flakes or micro-pellets, supplemented with live or frozen foods like brine shrimp, daphnia, or bloodworms for enhanced vibrancy. 

Lifespan & Hardiness

• Hardy and beginner-friendly, with an average lifespan of 3–5 years, sometimes up to 7 with excellent care