Purple Harlequin Rasbora (Rasbora heteromorpha “Purple”) – Vibrant Schooling Nano Fish for Sale

Purple Harlequin Rasbora Care Guide

Purple Harlequin Rasboras (Trigonostigma heteromorpha) are peaceful, colorful schooling fish that thrive in planted community aquariums. Known for their shimmering purple-blue coloration and active swimming behavior, these nano fish are an excellent choice for both beginner and experienced aquarists. When kept in stable water conditions with a proper school, Purple Harlequin Rasboras are hardy, low-maintenance fish that display incredible color and natural schooling behavior.

Tank Size for Purple Harlequin Rasboras

A minimum tank size of 10 gallons is recommended for Purple Harlequin Rasboras, though larger aquariums are ideal for bigger schools and more natural behavior. Since these fish are active swimmers, horizontal swimming space is more important than tank height.

Larger planted aquariums with driftwood, live plants, and open swimming areas help reduce stress and improve coloration.

Water Parameters

Purple Harlequin Rasboras prefer stable tropical water conditions:

• Temperature: 72–80°F
• pH: 6.0–7.5
• GH: Soft to moderately hard water
• Ammonia/Nitrite: 0 ppm
• Nitrate: Under 20 ppm preferred

Stable parameters are more important than chasing exact numbers. Regular water changes and proper filtration will help keep your fish healthy and active.

Ideal Tank Setup

Purple Harlequin Rasboras thrive in planted aquariums that mimic their natural habitat. They appreciate dense plant cover combined with open areas for schooling.

Ideal setup features include:

• Live aquarium plants
• Driftwood and natural hardscape
• Dark substrate for enhanced coloration
• Gentle to moderate flow
• Open midwater swimming space
• Dim or natural-style lighting

Live plants such as Java Moss, Anubias, Cryptocoryne, and stem plants work especially well for rasbora tanks.

Are Purple Harlequin Rasboras Schooling Fish?

Yes, Purple Harlequin Rasboras are true schooling fish and should always be kept in groups of at least 6. Larger groups of 10 or more will display tighter schooling behavior, improved confidence, and significantly better coloration.

Keeping too few rasboras can lead to stress, hiding, and washed-out colors.

Are Purple Harlequin Rasboras Safe With Shrimp?

Yes, Purple Harlequin Rasboras are generally considered shrimp safe and are commonly kept in planted shrimp aquariums. They coexist very well with adult Neocaridina and Caridina shrimp.

As with most nano fish, very small shrimplets may occasionally be eaten, especially in sparsely planted tanks. Dense moss and hiding areas greatly improve shrimp survival.

What Do Purple Harlequin Rasboras Eat?

Purple Harlequin Rasboras are omnivores and readily accept a variety of foods.

A balanced diet may include:

• High-quality nano pellets
• Micro flakes
• Frozen baby brine shrimp
• Daphnia
• Cyclops
• Micro worms
• Live foods occasionally

Feeding a varied diet helps improve coloration, health, and breeding condition.

Breeding Purple Harlequin Rasboras

Breeding Purple Harlequin Rasboras is possible in mature planted aquariums with stable water conditions. They are egg scatterers and may deposit eggs on the underside of broad-leaf plants.

For best breeding success:

• Maintain soft, clean water
• Feed live and frozen foods regularly
• Use dense plants or spawning mops
• Remove adults after spawning if raising fry

The fry are very small and require infusoria or powdered fry foods initially.