Can Red Rainbowfish live in a planted community tank?

Yes, and this is one of the best settings for the species. Red Rainbowfish generally leave live plants alone, unlike many similarly sized community fish, which makes them an excellent centerpiece school for a densely planted aquarium. Their vivid coloration is shown off particularly well against a dark substrate and green plant backdrop. You must still choose plant species that tolerate the strong water movement and high filtration turnover this fish requires, since delicate, slow-growing plants can struggle in the same high-flow conditions that keep Red Rainbowfish healthy.

What should I feed Red Rainbowfish, and how often?

Feed a Red Rainbowfish school 1-2 times daily as much as they can consume in about 2 minutes. This species is an active, greedy omnivore, so offer a varied diet built around a high-quality flake or slow-sinking granule as the base, supplemented several times per week with frozen or live daphnia, brine shrimp, and bloodworms for protein. You must also include spirulina flake and occasional blanched peas to round out the plant matter portion of the diet and support digestive health and coloration.

What tankmates are safe, and which should I avoid, with Red Rainbowfish?

Safe tankmates include other similarly sized, active peaceful community fish such as other rainbowfish species, larger tetras, barbs, danios, gouramis, and corydoras catfish. You must avoid pairing Red Rainbowfish with very small, slow, or timid species such as tiny nano fish or long-finned bettas, since the rainbowfish's constant high-energy activity, rather than outright aggression, can stress or outcompete more sedate tankmates at feeding time. Fin-nipping or plant-eating species such as certain cichlids and puffers should also be avoided.

How do I breed Red Rainbowfish, and is it difficult?

Red Rainbowfish are considered one of the easier rainbowfish species to breed. Condition a group of 8-10 mature adults at a 1 male to 2 female ratio on live blackworms and brine shrimp for about 3 weeks, then provide a spawning mop or a dense clump of java moss in either the main tank or a dedicated 30 gallon (113 liter) breeding tank. Spawning typically occurs at dawn, with females scattering small batches of adhesive eggs onto the mop or plants daily over several days rather than in one large event. You must remove the spawning medium (with eggs attached) every 1-2 days to a separate rearing container to prevent the adults from eating the eggs. Eggs hatch in roughly 7-10 days, and fry should be started on infusoria before graduating to microworms and then newly hatched baby brine shrimp.

Red Rainbowfish (Glossolepis incisus)

FreshwaterMelanotaeniidae Familypeaceful, but boisterous and highly active - can intimidate slow or timid tankmates through sheer activity level rather than aggressionintermediate Care

Quick Answer

The Red Rainbowfish (Glossolepis incisus) is a vividly colored, active schooling fish requiring a minimum 55 gallon (208 liter) aquarium at least 48 inches (120 cm) long, a school of 6 or more, pH 7.0-8.0, and a temperature of 72-78 degrees F (22-26 degrees C). It is peaceful but boisterous, and males develop their signature deep red coloration best in a well-fed, properly sized school.

Lifespan 7 years

Max Size 6 in (15.2 cm)

Difficulty intermediate

Diet Omnivore

Quick Facts

Scientific Name	Glossolepis incisus
Common Names	Red Rainbowfish
Family	Melanotaeniidae
Genus	Glossolepis
Type	Freshwater
Temperament	peaceful, but boisterous and highly active - can intimidate slow or timid tankmates through sheer activity level rather than aggression
Care Difficulty	intermediate
Lifespan	7 years
Maximum Size	Up to 6 in (15 cm)
Diet	Omnivore
Temperature	72–78°F (22–26°C)
pH	7–8
Hardness	8–20 dGH
Minimum Size	55 gallons

Key Takeaways

Peaceful but highly active - can intimidate small or timid tankmates through sheer energy rather than aggression.
Requires a school of at least 6, ideally 8-10, in a 55 gallon (208 liter) tank at least 48 inches (120 cm) long.
Male coloration depends on school size, diet, and water hardness - undersized groups and soft water both dull red color.
Unusually intolerant of ammonia and nitrite - only add to a fully cycled, mature aquarium.
One of the easier rainbowfish species to breed, using a spawning mop and daily egg collection.

Essential Requirements

Beginner Aquarium Setup

Learn how to build the perfect first tank.

Water Chemistry

Keep parameters stable and safe.

Nitrogen Cycle

Understanding the aquarium cycle.

Diet

What to Feed Red Rainbowfish

This is an active, greedy omnivore that should be fed 1-2 times daily. Build the diet around a high-quality flake or slow-sinking granule formulated for community fish, and supplement several times weekly with frozen or live daphnia, brine shrimp, and bloodworms for protein.

Color-Enhancing Nutrition

You must include carotenoid-rich foods such as spirulina flake, krill, and color-enhancing pellets to support the male's full red coloration. A plain, unvaried diet is one of the most common and overlooked reasons a school of Red Rainbowfish never develops the striking color the species is known for.

Plant Matter

Offer blanched peas or spirulina-based foods weekly to round out the roughly 40 percent plant-matter portion of this species' natural diet and support healthy digestion.

Breeding

Breeding Difficulty

Red Rainbowfish are considered one of the more approachable rainbowfish species to breed in a home aquarium. Condition a group of 8-10 mature adults, ideally at a ratio of 1 male to 2 females, on live blackworms and brine shrimp for approximately 3 weeks before introducing spawning material.

Spawning Setup and Process

Provide a spawning mop or a dense clump of java moss, either in the main display or in a dedicated 30 gallon (113 liter) breeding tank set to pH 7.2, roughly 10 dGH, and 74 degrees F (23 degrees C). Spawning typically happens at dawn, with females scattering 100-300 small adhesive eggs across the mop or plants over several consecutive days rather than a single event.

Raising Fry

You must remove the spawning medium with attached eggs every 1-2 days to a separate rearing container, since adults will readily eat their own eggs. Eggs hatch in roughly 7-10 days at 72 degrees F (22 degrees C). Start fry on infusoria for the first few days, then transition to microworms, and finally to newly hatched baby brine shrimp as they grow. Frequent small water changes during grow-out are essential for healthy fry development.

Compatible Tank Mates

African Butterflyfish

Fair Match

More fish guides

African Cichlid

Fair Match

More fish guides

African Leaf Fish

Fair Match

More fish guides

African Red Eyed Tetra

Fair Match

More fish guides

Angelfish

Fair Match

More fish guides

Apistogramma

Fair Match

More fish guides

African Butterflyfish

Fair Match

More fish guides

African Cichlid

Fair Match

More fish guides

African Leaf Fish

Fair Match

More fish guides

African Red Eyed Tetra

Fair Match

More fish guides

Angelfish

Fair Match

More fish guides

Apistogramma

Fair Match

More fish guides

Species Comparison

Feature	Red Rainbowfish (G. incisus)	Boesemani Rainbowfish (M. boesemani)	Dwarf Neon Rainbowfish (M. praecox)	Turquoise Rainbowfish (M. lacustris)
Max Size	6 in (15 cm),4-4.7 in (10-12 cm),2.4 in (6 cm),3.5 in (9 cm)
Temperament	Peaceful but boisterous / very active,Peaceful, moderately active,Peaceful, calm - suited to smaller tanks,Peaceful, active
Minimum Tank Size	55 gal / 208 L, 48 in / 120 cm long,40 gal / 151 L,20 gal / 76 L,40 gal / 151 L
Diet	Omnivore,Omnivore,Omnivore,Omnivore
pH Range	7.0-8.0,7.0-8.0,6.5-7.5,7.5-8.5
Schooling Number	6+ (8-10 ideal),6+,6+,6+

Frequently Asked Questions

How many Red Rainbowfish should be kept together?

You must keep Red Rainbowfish in a school of at least 6 individuals, and ideally 8-10 or more, in a tank of at least 55 gallons (208 liters) with a footprint of at least 48 x 15 inches (120 x 38 cm). This is a genuinely obligate schooling species; unlike fish kept alone for color alone, a lone Red Rainbowfish or a group smaller than 5-6 will show dull, washed-out coloration and can become unusually pushy toward smaller tankmates. Aim for a mixed-sex group with a slight female skew (roughly 1 male to 2 females) to reduce single-male harassment and encourage natural courtship displays across the whole group rather than aggression from one dominant male.

What is the exact minimum tank size and dimensions for Red Rainbowfish?

The absolute minimum is a 55 gallon (208 liter) aquarium for a school, and tank length matters more than raw volume for this species. You must provide a tank at least 48 inches (120 cm) long, since Red Rainbowfish are fast, powerful open-water swimmers that need a long horizontal swimming lane to display and school naturally. A tall but short-footprint tank of the same gallonage is a poor substitute. As the school matures toward its adult 6 inch (15 cm) size, many experienced keepers upgrade to 75 gallons (284 liters) or more for long-term comfort.

Why are my male Red Rainbowfish not turning red?

Color intensity in male Red Rainbowfish depends on three factors you must get right: school size, diet, and water hardness. A lone male or one kept in a group smaller than 5-6 fish frequently stays a dull bronze-brown rather than developing full red coloration, since color intensity is partly a social and competitive display. You must also feed a carotenoid-rich diet including spirulina flake, krill, and color-enhancing pellets; a plain flake-only diet produces noticeably duller fish. Finally, soft water below roughly 5-8 dGH suppresses coloration in this species, which naturally favors moderately hard, slightly alkaline conditions.

What diseases and health problems are Red Rainbowfish prone to?

Red Rainbowfish are considered hardy once established, but you must know they are unusually intolerant of ammonia and nitrite spikes and should never be added to a biologically immature tank. The most common health issues are secondary bacterial and fungal infections that take hold after stress from poor water quality, overcrowding, or being kept in too small a school. Watch for clamped fins, color loss, and lethargy as early indicators of declining water quality rather than waiting for visible disease symptoms. Standard freshwater ich (Ichthyophthirius multifiliis) can affect this species like any other freshwater fish, and is best addressed with a gradual temperature increase and a copper- or formalin-based treatment dosed according to the product label.