What is the minimum tank size for Betta Fish?

The minimum tank size for Betta Fish is 5 gallons.

What temperature does Betta Fish need?

Betta Fish requires a temperature range of 75-80°F with a pH of 6.5-7.5.

Is Betta Fish peaceful or aggressive?

Betta Fish is semi-aggressive. It grows to 2.8 inches and requires a beginner level of care.

Betta Fish — Fish Profile

Betta splendens

Quick Specs

Adult Size:	2.8"
Temperament:	semi-aggressive
Care Level:	beginner
Min Tank Size:	5 gallons
Temperature:	75-80°F
pH Range:	6.5-7.5
Diet:	carnivore
Origin:	Southeast Asia
Lifespan:	3-5 years

Overview

Betta fish are known for their vibrant colors and flowing fins. Male bettas are territorial and should be housed alone or with peaceful community fish.

Care Guide for Betta Fish

Tank Setup

Betta Fish requires a minimum tank size of 5 gallons. Maintain water temperature between 75°F and 80°F, with a pH range of 6.5 to 7.5. A properly sized tank with adequate filtration and regular water changes is essential for long-term health. When housing Betta Fish with other species, always choose a tank size that accommodates the most demanding fish in the community.

Feeding

Betta Fish is a carnivore feeder. Provide a varied diet appropriate for carnivore species to ensure optimal health and coloration. Feed small portions 2–3 times daily, and remove uneaten food after a few minutes to maintain water quality.

Temperament & Compatibility

This species is classified as semi-aggressive. Betta Fish reaches an adult size of 2.8 inches and has a care level of beginner. Always research compatibility before adding new fish to an established aquarium. Individual temperament can vary, so monitor new introductions closely for the first 48 hours.

Origin & Lifespan

Betta Fish originates from Southeast Asia and has an expected lifespan of 3-5 years when kept in proper water conditions with appropriate tank mates and diet.

Compatible Tank Mates

🟢 Good Tank Mates

Corydoras Neon Tetra Guppy Platy

🟡 Caution Tank Mates

Dwarf Gourami Molly

🔴 Risky Tank Mates

Tiger Barb Angelfish

Compatibility Results for Betta Fish

All 69 compatibility checks involving Betta Fish:

🟢 Amano Shrimp 🟢 Boeseman's Rainbowfish 🟢 Bolivian Ram 🟢 Cardinal Tetra 🟢 Celestial Pearl Danio 🟢 Cherry Barb 🟢 Cherry Shrimp 🟢 Cockatoo Dwarf Cichlid 🟢 Congo Tetra 🟢 Ember Tetra 🟢 Emperor Tetra 🟢 Guppy 🟢 Honey Gourami 🟢 Kribensis 🟢 Kuhli Loach 🟢 Lemon Tetra 🟢 Molly 🟢 Mystery Snail 🟢 Neon Rainbowfish 🟢 Nerite Snail 🟢 Otocinclus Catfish 🟢 Paradise Fish 🟢 Pearl Gourami 🟢 Red-Eye Tetra 🟢 Rummy-Nose Tetra 🟢 Sparkling Gourami 🟢 Upside-Down Catfish 🟡 Angelfish 🟡 Bala Shark 🟡 Bichir 🟡 Black Skirt Tetra 🟡 Bristlenose Pleco 🟡 Bristlenose Pleco 🟡 Clown Loach 🟡 Common Plecostomus 🟡 Corydoras Catfish 🟡 Dwarf Gourami 🟡 Dwarf Pufferfish 🟡 Electric Blue Acara 🟡 Electric Yellow Lab 🟡 Firemouth Cichlid 🟡 German Blue Ram 🟡 Gold Barb 🟡 Harlequin Rasbora 🟡 Lyretail Killifish 🟡 Neon Tetra 🟡 Panda Corydoras 🟡 Platy 🟡 Rainbow Shark 🟡 Red Tail Black Shark 🟡 Serpae Tetra 🟡 Siamese Algae Eater 🟡 Silver Arowana 🟡 Silver Dollar 🟡 Tiger Barb 🟡 YoYo Loach 🔴 Blood Parrot Cichlid 🔴 Discus 🔴 Electric Blue Crayfish 🔴 Flowerhorn 🔴 Goldfish 🔴 Heckel Discus 🔴 Hillstream Loach 🔴 Jack Dempsey 🔴 Oscar 🔴 Swordtail 🔴 Weather Loach 🔴 White Cloud Minnow 🔴 Zebra Danio

Recommended for Betta Fish

Fluval Spec V Aquarium Kit — $79.99

5-gallon nano tank perfect for betta fish

Expert Care Tips for Betta Fish

Nano tank suitable: Betta Fish can thrive in smaller tanks (5+ gal), but skip the bowl — even small fish need filtration and a heater.
Tropical range: Keep Betta Fish at 75–80°F. A 50W heater per 10 gallons is a safe rule of thumb for stable temperature.
Narrow pH tolerance: Betta Fish only tolerates pH 6.5–7.5. Test your tap water before buying — adjusting pH is harder than choosing the right fish for your water.
Semi-aggressive temperament: Betta Fish is generally peaceful but can become territorial. Provide ample hiding spots and avoid housing with fin-nipping species.
Acclimation: Always drip-acclimate Betta Fish over 30–45 minutes. Match temperature and pH gradually to prevent osmotic shock.

Tools & Resources

Tank Stocking Calculator Browse All Fish

⚠️ Common Betta Diseases: Ich, Fin Rot & Dropsy (Symptoms & Treatment)

Betta fish are susceptible to several common freshwater diseases, particularly when kept in small, unfiltered tanks with poor water quality. Early identification and prompt treatment are critical — bettas in bowls or nano tanks deteriorate faster than fish in larger, filtered setups.

Ich (White Spot Disease)

Symptoms: White salt-like spots on body and fins, flashing/rubbing against objects, clamped fins, lethargy, loss of appetite

Treatment: Raise temperature to 82-86°F gradually (2°F per day). Treat with malachite green or formalin-based medication. Add aquarium salt (1 tsp per gallon). Perform daily 25% water changes. Continue treatment for 7-10 days after last visible spot.

Fin Rot

Symptoms: Fins appear frayed, ragged, or melting at edges; discoloration at fin tips (white, red, or black edges); fins progressively shortening

Treatment: Improve water quality immediately (ammonia and nitrite must be 0). Perform 50% water change. Treat with antibiotic medication (Kanamycin or Tetracycline). Add aquarium salt (1 tsp per gallon). Clean filter media. Fin regrowth takes 4-8 weeks in clean water.

Dropsy

Symptoms: Severe body swelling (pinecone appearance with raised scales), bulging eyes, pale feces, lethargy, loss of appetite, redness at fin bases

Treatment: Dropsy is often fatal once scales are raised — it indicates organ failure. Isolate fish immediately. Treat with Epsom salt (1/8 tsp per 5 gallons) to reduce swelling. Use broad-spectrum antibiotic (Kanamycin). Maintain pristine water quality. Early detection before scale raising offers the best chance of recovery.

Always quarantine sick fish and consult an aquatic veterinarian for persistent health issues.