Black King Crowntail Betta Fish:

1. What It Is

The Black King Crowntail Betta is a selectively bred variety of Betta splendens combining:

• “King” (Giant) Betta genetics → larger, bulkier body

• Crowntail fin type → spiky, ray-extended fins

• Black coloration → often jet black or near-black

It is not a separate species—just a premium ornamental strain.

2. Appearance

Size

• Larger than standard bettas

• Typically 3.5–4 inches (9–10 cm), sometimes slightly more

Color

• True black is rare

• Most show:

  • Deep velvet black

  • Black with iridescent green/blue sheen

  • Occasional metallic highlights under light

Fins

• Crowntail rays extend beyond webbing

• Dramatic, spiky look

• Kings often have shorter but thicker fins than standard crowntails

Body

• Thick, muscular, powerful build

• Broader head and body than regular bettas

3. Temperament & Behavior

• Highly territorial (more so than standard bettas)

• Aggressive toward:

  • Other male bettas

  • Fish with long fins or bright colors

• Can flare frequently

• Intelligent and interactive with owners

Best kept alone or with carefully chosen tankmates (if any).

4. Tank Requirements

Because they are larger and more active than standard bettas:

Minimum Tank Size

• 10 gallons recommended

• Absolute minimum: 7.5 gallons (not ideal)

Water Parameters

• Temperature: 78–82°F (25.5–28°C)

• pH: 6.5–7.5

• Soft to moderately hard water

• Stable conditions are critical

Filtration

• Gentle filter flow (they dislike strong currents)

• Sponge filters are ideal

Tank Setup

• Live plants (Anubias, Java fern, floating plants)

• Smooth decorations only (crowntail fins tear easily)

• Hiding spots

• Lid required (bettas jump)

5. Diet

Carnivorous insect-eaters.

Staple Foods

• High-quality betta pellets (high protein)

• Betta-specific granules

Supplemental Foods

• Frozen or live:

  • Bloodworms

  • Brine shrimp

  • Daphnia

  • Blackworms

Feeding Frequency

• 1–2 times daily

• Small portions (Kings eat more, but overfeeding is common)

6. Health & Lifespan

Lifespan

• 3–5 years with proper care

Common Issues

• Fin rot (especially crowntails)

• Swim bladder issues (overfeeding)

• Stress-related color fading

• Ich if water quality declines

Prevention

• Weekly water changes (25–40%)

• Clean, warm, stable water

• Avoid sharp décor

7. Breeding Notes

• More difficult than standard bettas

• King bettas are less fertile

• Males still build bubble nests

• Fry are larger but fewer in number

• Requires experience and space

Not recommended for beginners.

8. Who This Fish Is Best For

✅ Intermediate to advanced betta keepers
✅ People wanting a bold, aggressive-looking centerpiece fish
❌ Not ideal for community tanks
❌ Not ideal for very small aquariums