Boesemani Rainbowfish

A split-colour masterpiece — cobalt front, blazing orange rear — and one of the largest commonly kept rainbowfish. Needs a long tank, hard alkaline water, and a big shoal to thrive.

• Minimum footprint: 40 gallons; a 55+ gallon tank gives real swimming room.
• Preferred swimming zone: middle of the water column.
• Social — keep a group of at least 6.
• Care level: moderate.

• Temperature: 75–82°F
• pH: 7–8
• Hardness: 8–20 dGH (Hard)

Stable parameters matter more than perfect ones — aim for consistency before chasing an exact number.

peaceful

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An omnivore — offer a staple flake or pellet plus regular frozen or live foods (daphnia, bloodworm, brine shrimp) and some vegetable matter for balance.

No outright-compatible species in our current database — check individual pairings with the compatibility tool.

A further 25 species pairs with Boesemani Rainbowfish as conditional — workable with the right tank and precautions.

Standard tanks at or above the recommended 55 gallons:

• 55 gallon 48 × 13 × 21″
• 75 gallon 48 × 18 × 21″
• 90 gallon 48 × 18 × 25″
• All tank sizes

• Start from a 40 gallon minimum and plan the full group size (6+) before you buy.
• Activity level is high, which affects how much of the tank it uses and how much it adds to the bioload.
• Zoning matters: this species lives mostly in the middle zone, so choose tank mates that occupy other levels.

Compatibility depends on tank size, water chemistry, temperament, and adult size. Run a full check against any species in our database.

• FishBase(Scientific Database, accessed 2026-09-20)
• SeriouslyFish(Specialist Publication, accessed 2026-09-20)
• Practical Fishkeeping(Specialist Publication, accessed 2026-09-20)
• Aquarium Forge editorial guidelines(Editorial Interpretation, accessed 2026-09-22)

Data reviewed: September 2026 · Data version: 2026.11
Editorial note: Minimum tank recommendations may vary by source and husbandry approach. Our figures synthesise the sources above for planning purposes.