Red Rainbowfish 'Glossolepis incisus'

⚫ Red Rainbowfish (Glossolepis incisus) Care Guide

Also known as the Salmon Red Rainbowfish

The Red Rainbowfish is a stunning freshwater species from Lake Sentani, Papua, renowned for its intense red coloration and active schooling behavior. Males develop deep crimson hues as they mature, making this species a spectacular centerpiece for large planted aquariums.

---

Tank Requirements

Minimum Tank Size: 200 litres

Temperature: 24–28°C

pH: 7.0–8.0

GH: 8–20

KH: 6–12

TDS: 200–400 ppm

They thrive in clean, well-oxygenated water with strong filtration and moderate flow. Larger tanks help bring out their best color and natural schooling behavior.

---

Habitat Setup

Recreate their natural lake environment with:

• Sand or fine gravel substrate

• Dense live plants along the sides and back

• Open swimming space in the center

• Moderate water flow

Bright lighting enhances their coloration, especially in mature males.

---

️ Feeding

Red Rainbowfish are omnivorous and enthusiastic feeders:

• High-quality flakes or pellets

• Frozen foods (brine shrimp, bloodworms, daphnia)

• Occasional vegetable-based foods or spirulina

Feed 1–2 times daily with varied foods to support coloration and health.

---

Tank Mates

Red Rainbowfish are peaceful, active, and social, best kept in groups of 6 or more (with a higher ratio of females to males).

Ideal companions:

• Other large Rainbowfish

• Peaceful barbs

• Corydoras

• Large peaceful tetras

Avoid:

• Aggressive or fin-nipping fish

• Very small or timid species

⚠️ Behavioral Note: Males display to one another with flared fins and intense coloration but rarely cause harm.

---

Breeding

Breeding is possible in aquariums.

• Egg scatterers, spawning among fine-leaved plants or spawning mops

• Eggs hatch in 7–10 days

• Fry are small and require infusoria, then baby brine shrimp

Adults do not provide parental care.

---

Sexing / Identification

Males:

• Larger and deeper-bodied

• Intense red coloration

• Extended fins

Females:

• Smaller

• Silvery or yellowish coloration

• More streamlined body

---

Interesting Fact

In the wild, Red Rainbowfish populations have declined significantly due to habitat loss and introduced species, making captive breeding an important part of conserving this iconic fish.

---

Reference: Bubbly Fish – Creating underwater wonders