By weeebooo70@gmail.com 
Blue guppy fish are among the most eye-catching freshwater aquarium fish. Their vibrant metallic blues—from sky blue to deep navy—make them a favorite for hobbyists, breeders, and aquascape enthusiasts.
Like all guppies, blue varieties belong to the species Poecilia reticulata. Through selective breeding, aquarists have developed stunning blue strains with unique patterns and tail shapes.
This complete guide covers everything you need to know about blue guppy fish—care, types, breeding, feeding, and tank setup.
🐠 What Is a Blue Guppy?
A blue guppy is a selectively bred strain displaying dominant blue coloration on the body, tail, or both.
High-quality blue guppies typically show:
- Intense metallic blue color
- Uniform shading without fading
- Symmetrical, wide tail
- Strong swimming behavior
- Clear, bright eyes
Some strains are solid blue, while others have mosaic or patterned tails.
💙 Popular Types of Blue Guppy Fish
1️⃣ Blue Moscow Guppy
One of the most famous strains.
- Solid deep blue body and tail
- Metallic sheen
- Premium breeding line
Highly valued among serious breeders.
2️⃣ Blue Mosaic Guppy
- Blue base with intricate mosaic pattern
- Often large delta tail
- Popular for display tanks
3️⃣ Blue Cobra Guppy
- Snakeskin-style pattern
- Metallic blue mixed with patterning
- Very attractive in planted tanks
4️⃣ Sky Blue / Japan Blue Guppy
- Lighter blue tones
- Often paired with other tail patterns
- Unique body striping
🏠 Ideal Tank Setup for Blue Guppies
Blue guppies thrive in stable, well-maintained aquariums.
Tank Size
- Minimum: 10 gallons
- Recommended: 20 gallons
Larger tanks improve color and health.
💧 Ideal Water Parameters
| Parameter | Ideal Range |
|---|---|
| Temperature | 25–27°C |
| pH | 7.0–7.5 |
| Hardness | Moderate |
| Ammonia | 0 ppm |
| Nitrite | 0 ppm |
| Nitrate | Below 20 ppm |
Stable water quality helps maintain strong blue coloration.
🌿 Best Aquascape for Blue Guppies
Blue guppies look stunning against:
- Bright green plants
- Dark substrate
- Black or dark blue background
Recommended plants:
- Java moss
- Anubias
- Rotala
- Water sprite
- Vallisneria
Leave open swimming space in the center.
Feeding for Strong Blue Color
Diet plays a major role in color development.
Daily Diet
- High-quality flakes or micro pellets
Protein Foods (2–3 times weekly)
- Brine shrimp
- Bloodworms
- Daphnia
Color-Enhancing Foods
- Spirulina-based foods
- Natural carotenoid-rich diet
Avoid overfeeding—small portions twice daily is ideal.
🐣 Breeding Blue Guppies
Blue guppies are livebearers.
- Gestation: 21–30 days
- 20–50 fry per batch
- Fry born free-swimming
Tips for Maintaining Blue Line
- Breed blue to blue
- Separate males early
- Remove fry with faded color
- Keep strain pure (avoid mixing randomly)
Line breeding strengthens consistency.
🩺 Common Health Issues
Blue guppies may face:
- Fin rot
- Ich (white spot disease)
- Color fading from stress
- Weak genetics (if over line-bred)
Prevention:
- Weekly water changes
- Stable temperature
- Proper diet
🕒 Lifespan
With proper care, blue guppies live:
2–3 years.
High-quality genetics and stable care increase longevity.
🎯 How to Choose a High-Quality Blue Guppy
Look for:
✔ Deep, vibrant blue color
✔ No gray patches
✔ Wide, symmetrical tail
✔ Straight spine
✔ Active swimming
Avoid fish with:
✘ Torn fins
✘ Faded body
✘ Lethargic behavior
⚠️ Common Beginner Mistakes
- Overcrowding
- Mixing multiple strains
- Skipping water changes
- Poor-quality food
- Strong water flow
Simple, stable setups produce the best results.
🏆 Why Blue Guppies Are So Popular
- Striking metallic color
- Wide range of varieties
- Easy breeding
- Perfect for planted aquascapes
- Great for beginner and advanced hobbyists
They stand out beautifully in well-designed aquariums.
Final Thoughts
Blue guppy fish combine elegance, color intensity, and easy care. Whether you choose a Blue Moscow, Blue Mosaic, or Cobra variety, proper tank conditions, nutrition, and selective breeding will keep your fish vibrant and healthy.
With the right setup and maintenance, blue guppies can transform your aquarium into a brilliant, living display of color.