Betta splendens (Koi Yellow Galaxy Female Betta)
Betta splendens (Koi Yellow Galaxy Female Betta)
Species:
Betta splendens (Koi Yellow Galaxy Female Betta)
Growth Form:
Short-finned (female form)
Coloration:
Yellow/golden base with koi-style marbling (orange/white/black) and metallic blue/green galaxy speckling
Temperament:
Semi-aggressive
Tank Size:
Minimum 5 gallons (10–20 gallons recommended for sorority/community setups)
Placement:
Top to mid-level swimmer
Lighting:
Low to moderate (enhances galaxy shimmer and color contrast)
Flow:
Low (gentle flow preferred)
Diet:
Carnivorous (protein-rich diet)
Feeding:
High-quality betta pellets, frozen/live foods (bloodworms, brine shrimp, daphnia); feed 1–2 times daily in small portions
Care Level:
Moderate to Advanced
Betta splendens (Koi Yellow Galaxy Female Betta)
Species:
Betta splendens (Koi Yellow Galaxy Female Betta)
Common Name:
Koi Yellow Galaxy Betta, Yellow Galaxy Female Betta, Fancy Koi Galaxy Betta
Origin:
Captive-bred (selectively bred Betta splendens from Southeast Asian lineage)
Lifespan:
2–4 years (with proper care and stable conditions)
Appearance:
The Koi Yellow Galaxy Female Betta is a highly decorative strain combining multiple premium color traits. The “Koi” aspect produces a marbled pattern of yellow, orange, white, and occasional black patches, resembling ornamental koi fish. Layered over this is the “Galaxy” trait—fine metallic iridescent speckling in blue, green, or steel tones that gives a shimmering, star-dusted effect.
The yellow base coloration ranges from soft lemon to deeper golden hues, often blending unpredictably with koi marbling. Females typically have shorter fins, but their compact body allows the color pattern and metallic sheen to stand out clearly.
Temperament:
Semi-aggressive. Generally more peaceful than males but still territorial, especially toward other bettas. Can be kept in sororities with careful planning, adequate space, and closely monitored compatibility.
Tank Size:
Minimum: 5 gallons
Recommended: 10–20 gallons (especially for sorority or community setups)
Water Parameters:
- Temperature: 24–28°C (75–82°F)
- pH: 6.5–7.5
- Hardness: Soft to moderately hard water
- Ammonia/Nitrite: 0 ppm
- Nitrate: <20 ppm
Stable water conditions are essential to maintain both koi pattern clarity and galaxy iridescence.
Tank Setup:
- Gentle filtration with low flow
- Heavily planted aquarium or aquascaped layout
- Driftwood, caves, and dense plants for hiding and territory breaks
- Dark or natural substrate enhances yellow and metallic contrast
- Lid required (bettas are known jumpers)
- Calm environment to reduce stress and aggression
Diet:
Carnivorous
Requires a protein-rich diet for color vibrancy and overall health
Feeding:
- High-quality betta pellets as staple diet
- Frozen/live foods: bloodworms, brine shrimp, daphnia
- Feed 1–2 times daily in small portions
- Occasional fasting day recommended to prevent bloating
Tank Mates:
Compatible with:
- Peaceful bottom dwellers (Corydoras, Kuhli loaches)
- Snails
- Some small peaceful community fish (with caution)
Use caution with:
- Other female bettas (only in well-managed sororities)
- Small or brightly colored fish that may trigger aggression
Avoid:
- Male bettas
- Fin-nipping or aggressive species
- Fish with similar body shape or flowing fins
Behavior Notes:
- Curious and responsive to keeper interaction
- May flare occasionally depending on surroundings
- Uses labyrinth organ to breathe atmospheric air
- Enjoys resting near plants or broad leaves close to the surface
- Displays subtle dominance behavior in group settings
Breeding:
Bubble nest spawning species
Females participate in spawning but do not provide parental care
Breeding requires a controlled, separate setup with careful conditioning and pairing
Care Level:
Moderate to Advanced
Special Notes:
- Each koi-yellow galaxy pattern is completely unique and may shift slightly over time
- High-quality diet enhances both yellow saturation and metallic galaxy shimmer
- Stress or poor water conditions can quickly dull coloration
- Provide surface resting spots to reduce fin fatigue
- Regular weekly water changes (25–30%) are essential for long-term health and color stability

