Rainbowfish Care Sheet
BeginnerMelanotaenia boesemani · fish
Rainbowfish are active, schooling fish that add vibrant color to community tanks. They thrive in groups and prefer well-planted aquariums with open swimming spaces.
Quick care stats
Adult size3-4 inches
Lifespan5-8 years
Min tank size30 gallons
Water temp74-82F
pH6.5-8.0
Hardness5-15 dGH
Temperamentpeaceful
Group / schoolinggroup of 6+
Tank matesPeaceful community fish like tetras, rasboras, and corydoras.
DietOmnivorous; feed high-quality flake or pellet daily supplemented with frozen or live foods 2-3 times per week.
What you need (full setup)
🔧 Aquarium tank (30+ gallons)Provides ample swimming space for a school of rainbowfish.🔧 Canister or HOB filterMaintains excellent water quality and provides gentle flow.🔧 Adjustable heater (100-200W)Keeps stable temperature in the 74-82F range.🔧 ThermometerMonitors water temperature for consistency.🔧 Fine sand or smooth gravel substrateSafe for bottom-dwelling tank mates and natural looking.🔧 Water conditioner (dechlorinator)Removes chlorine and chloramines from tap water.🔧 Liquid test kit (pH, ammonia, nitrite, nitrate)Essential for monitoring water parameters and cycling.🔧 Live plants and driftwoodProvides cover and reduces stress; hardy plants like Java fern and Anubias work well.
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Common health issues
- Ich
- Fin rot
- Stress from insufficient group size
⚠️ For any sign of illness (not eating, lethargy, swelling, retained shed), see a qualified exotics vet. Care sheets are general guidance only.