Freshwater Fish

Red Irian Rainbowfish

Glossolepis incisus

Care guide, husbandry, breeding, disease, and sourcing intelligence on Red Irian Rainbowfish - written by the Fast Aquatics editorial team.

Red Irian Rainbowfish at a glance
Adult size: 5 inches · Min tank/pond: 55 gallons · Difficulty: beginner · Diet: omnivore · Lifespan: 5-8 years.

Red Irian Rainbowfish (Glossolepis incisus) is a popular freshwater fish in the aquarium and pond hobby. Hardy and forgiving when given proper water chemistry.

Where Red Irian Rainbowfish comes from

Red Irian Rainbowfish (Glossolepis incisus) is native to specific tropical and subtropical freshwater systems. Captive-bred specimens at most LFS come from generations of farmed stock and are generally hardier and more colorful than wild-caught equivalents.

Red Irian Rainbowfish tank size and setup

Red Irian Rainbowfish requires a minimum of 55 gallons for healthy adults. The minimum is based on 5 inches adult size and territorial range. Plan a tank sized for adult footprint, HOB or canister filter rated 4-6x volume, dechlorinated water, appropriate temperature heater, and stocking-appropriate hardscape.

Water parameters for Red Irian Rainbowfish

Red Irian Rainbowfish prefers freshwater parameters: temperature 74-80°F, pH 6.5-7.5, GH 4-12 dGH, KH 3-8 dKH, ammonia + nitrite 0 ppm, nitrate under 20 ppm. Use dechlorinator on every water change.

What Red Irian Rainbowfish eats

Red Irian Rainbowfish is a omnivore. Provide a varied diet of pellets, frozen foods, and supplemental greens. Feed twice daily in small portions. Browse our food guides for product recommendations.

Red Irian Rainbowfish tankmates and compatibility

Red Irian Rainbowfish works in community tanks with peaceful species in similar size class. Avoid mixing aggressive with passive species.

Red Irian Rainbowfish adult size and lifespan

Red Irian Rainbowfish reaches 5 inches at adulthood with a captive lifespan of 5-8 years with proper care.

Can you breed Red Irian Rainbowfish?

Red Irian Rainbowfish can be bred in dedicated breeding tanks with appropriate setup and water-chemistry triggers. Research the species-specific breeding requirements before attempting.

Common Red Irian Rainbowfish diseases and problems

Red Irian Rainbowfish is susceptible to standard freshwater diseases (ich, columnaris, fin rot, bacterial infections). Quarantine new Red Irian Rainbowfish for 4 weeks before adding to display.

Where to buy Red Irian Rainbowfish online

Red Irian Rainbowfish is sold at LFS, online retailers, and direct from breeders. Browse live Red Irian Rainbowfish from vetted Fast Aquatics vendors with carrier-tracked overnight shipping, climate-aware hold logic, and a 4-hour DOA window with photo-evidence claims.

Other species in the same category with care profiles on Fast Aquatics. Click any name for the full husbandry breakdown.

Gold Nugget PlecoL-018African LungfishBlue Velvet ShrimpAmano ShrimpApistogramma MacmasteriDouble Tail Betta

Sources and references

Red Irian Rainbowfish taxonomy and care recommendations cross-checked against the following authoritative references and our internal vendor + breeder database.

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More resources for Red Irian Rainbowfish keepers

Common diseases
Helpful calculators
Key terms

Browse the full disease database, calculator collection, aquarium glossary, or Q&A library for additional reference.

Deep-dive Q&A on Red Irian Rainbowfish

Answers to the questions experienced keepers ask after the basic care guide.

How long does Red Irian Rainbowfish take to acclimate to a new tank?

Drip acclimation over 60 to 90 minutes is the safest approach for Red Irian Rainbowfish. Match temperature first (15 minute float), then drip 2 to 3 drops per second from the display sump until the bag volume has tripled. Test salinity (or freshwater hardness) at the end - if it is within 0.001 SG (or 2 dGH) of the display, transfer the specimen with a net rather than pouring shipping water in.

What is the best filtration setup for Red Irian Rainbowfish?

Aim for biological + mechanical + chemical staging. Canister or sump-driven filtration sized for 5x to 8x display turnover per hour, mechanical floss replaced weekly, and carbon or GAC swapped every 4 to 6 weeks. Red Irian Rainbowfish responds well to stable nitrate (under 20 ppm) more than to any specific filter brand - stability beats peak performance.

Does Red Irian Rainbowfish need a protein skimmer?

For saltwater specimens, yes - a properly-sized skimmer rated for 1.5x to 2x display volume keeps dissolved organics low and reduces nuisance-algae triggers. Freshwater specimens do not need skimmers; a well-stocked plant grow-out + canister with chemical media achieves the same end. Red Irian Rainbowfish kept without adequate organic export tends to show stress within 90 days.

Can Red Irian Rainbowfish be kept in a planted tank?

Compatibility with planted tanks depends on the species behavior + water chemistry overlap. Plant-safe specimens leave foliage alone; some pick at soft-tissue plants like vallisneria or anubias. Check the species page profile + the planted-tank compatibility note before stocking Red Irian Rainbowfish in a high-tech CO2-injected setup with valuable cultivars.

What is the ideal lighting for Red Irian Rainbowfish?

For freshwater specimens with no plant requirements, a basic LED at 30 to 50 PAR at substrate is sufficient and reduces algae. For saltwater + reef specimens, target 100 to 250 PAR depending on photo-tolerance, with a sunrise/sunset ramp + a 8 to 10 hour photoperiod. Red Irian Rainbowfish tolerates a wider lighting band than most keepers expect; consistency matters more than peak intensity.

Does Red Irian Rainbowfish prefer high or low water flow?

Most aquarium species evolved in moderate flow with localized turbulence rather than uniform high flow. Aim for 20x to 40x display turnover for reef specimens, 4x to 6x for community freshwater. Red Irian Rainbowfish shows stress fins (clamped, frayed) when flow is mismatched - dial back if you see this within 14 days of introduction.

What temperature shift will stress Red Irian Rainbowfish?

Sustained drift above +/- 2 F from target is the threshold most keepers miss. Red Irian Rainbowfish tolerates day-night swings of 1 to 2 F without issue but a 4 F shift over 2 hours triggers ich + bacterial bloom risk. Use a controller-driven heater (not the built-in dial) and a backup thermometer at the opposite end of the tank.

What are the top 3 diseases that hit Red Irian Rainbowfish the most?

For freshwater fish: ich, columnaris, and fin rot are the top three; quarantine + UV sterilizer prevents the majority. For marine fish: ich (Cryptocaryon), velvet (Amyloodinium), and bacterial infections; tank-transfer method or copper QT during the 30-day acclimation cycle prevents nearly all outbreaks. For inverts + corals: tissue necrosis, parasitic isopods, and protozoan blooms.

Can Red Irian Rainbowfish be bred in captivity?

Captive breeding success varies enormously by species - some breed readily in community tanks (livebearers, cherry shrimp, clownfish) while others have never been captive-bred (most reef fish + most marine inverts). Check the species-specific care guide for the breeding-method note + larval-rearing protocol. Red Irian Rainbowfish kept in pairs or small groups often spawns even without intent if conditions are right.

What are the best tankmates to avoid for Red Irian Rainbowfish?

Avoid same-species rivals (especially male-male pairings for territorial species), known fin-nippers (tiger barbs, certain pufferfish), and anything that out-competes for food or out-grows the tank. Red Irian Rainbowfish also struggles with hyper-aggressive cichlids in freshwater and damselfish in saltwater - both will hold territory at the expense of every other tankmate.

Is Red Irian Rainbowfish safe to keep with cleaner shrimp or cleaner wrasses?

Most ornamental specimens accept cleaner shrimp + cleaner gobies; cleaner wrasses (Labroides) often die in captivity and are not recommended. Red Irian Rainbowfish kept with cleaner pairs typically benefits from parasite control + stress reduction, but verify the cleaner does not get eaten by checking the species size + temperament chart.

What is the realistic lifespan of Red Irian Rainbowfish with proper care?

Captive lifespan tracks closely to wild lifespan when water chemistry, diet, and tankmate stress are managed. Most aquarium fish live 5 to 12 years; long-lived species (large cichlids, pufferfish, some tangs) reach 15+ years. Red Irian Rainbowfish kept in a stable, properly-sized system should live within 80% to 100% of the species lifespan ceiling - early death usually traces back to chronic-stress causes (parameters, tankmates, diet) rather than disease.