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Girardinus falcatus

Yellow Belly, Sickle Girard (Girardinus falcatus) - Tropical Fish for Sale UK

Moderate Care
Peaceful
£6.99/ fishSold Out
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Live arrival guaranteed. If they don’t arrive healthy, email us a short unboxing video the same day for a replacement or refund. Packed in oxygenated bags with insulation and heat packs when needed.
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A hardy, attractive Cuban livebearer with a golden belly and bright blue eyes, ideal for peaceful planted aquariums. Moderate care, peaceful. 22-28C, pH 7.0-8.0.

Care at a Glance

Scientific Name
Girardinus falcatus
Max Adult Size
up to 3.5 cm
Lifespan
3 years
Care Level
Moderate
Temperament
Peaceful
Temperature
22–28°C
pH Range
7–8
Hardness
10–25 dGH
Minimum Tank
60L
Diet
Omnivore

Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller. Product-photo provenance and any image-specific limitations are stated on the listing.

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Water Parameters

Maintain these water conditions for optimal health and vibrant colors

Temperature
22–28°C
22°CIdeal28°C
pH Level
7–8
7Ideal8
Water Hardness
10–25 dGH
10 dGHIdeal25 dGH

Overview

Yellow Belly (Girardinus falcatus), also known as the Sickle Girardinus or Goldbelly Topminnow, is a hardy, attractive Cuban livebearer with a golden belly and bright blue eyes, ideal for peaceful planted aquariums. Native to Cuba, this species is prized for its subtle beauty, peaceful nature, and easy breeding habits. Now available for sale UK from Tropical Fish Co, this charming livebearer is ideal for the community aquarium enthusiast seeking a rare and colorful species.

Appearance

The Yellow Belly typically reaches around 3.5 cm in total length, making it a small livebearer. The body is robust and deep-bodied, with a pale silver or gold base color and a distinctive golden yellow belly. The eyes are bright blue, a striking feature that gives the species much of its visual appeal. The fins are delicate and transparent. Males are smaller than females and display more intense coloration. Healthy specimens have bright, clear eyes and smooth, undamaged scales.

Natural Habitat

In the wild, Girardinus falcatus is native to Cuba, where it inhabits slow-moving streams, ponds, marshes, and coastal lagoons with dense aquatic vegetation. These waters are typically moderately hard, warm, and slightly alkaline. The substrate is composed of fine mud or sand, and the fish spend much of their time among plants and cover, feeding on small invertebrates, algae, and organic detritus.

Aquarium Setup

A well-planted aquarium of at least 60 litres is recommended for a small group of Yellow Bellies. Use a fine gravel or sand substrate and incorporate plenty of live plants such as Vallisneria, Java fern, Cryptocoryne species, and floating plants to provide cover and hiding places. Ensure good filtration and moderate water movement. A secure lid is advisable, as livebearers can jump when startled. Maintain stable, warm water with slightly alkaline pH.

Water Parameters

  • Temperature: 22-28°C
  • pH: 7.0-8.0
  • Hardness: Moderately hard to hard water preferred
  • Filtration: Good flow, regular water changes essential

Feeding

The Yellow Belly is an omnivore and thrives on a varied diet. Offer quality flake or small pellet foods as a staple, supplemented with frozen and live foods such as daphnia, brine shrimp, mosquito larvae, and other small invertebrates. Include some vegetable matter or algae-based foods to support digestive health. Feed twice daily in small amounts to maintain excellent water quality.

Behaviour

This livebearer is peaceful, active, and social, constantly on the move and best kept in a small group. Males are smaller than females and will court continuously, so a proper ratio of females to males helps reduce stress. When kept in proper numbers, the Yellow Belly is confident and displays natural behavior. They occupy all levels of the aquarium and are most active during the day.

Top Tip: Best kept in a well-filtered, planted aquarium with stable warm, slightly alkaline water. Males can be persistent in courtship, so keep a proper ratio of females to males to reduce stress.

Tank Mates

The Yellow Belly is suitable for a peaceful community aquarium with other small fish. Good tankmates include other peaceful small fish of similar size and temperament, non-aggressive top-dwelling fish of similar size, and peaceful invertebrates too large to be eaten. Avoid large predatory fish, fin-nipping species, aggressive cichlids, and very small fry or shrimp that may be eaten.

Breeding

Breeding the Yellow Belly is straightforward. This is a livebearer that breeds readily in good conditions. Males are smaller than females and will court continuously. Provide dense planting or fine-leaved cover, as adults may eat fry. Females give birth to free-swimming fry that can be raised on very small live foods.

Why Buy from Tropical Fish Co

Tropical Fish Co is a leading UK aquatics specialist offering rare and beautiful livebearers like the Yellow Belly direct to your door. Every fish is quarantined, inspected, and dispatched with expert care to ensure it arrives in peak condition. With decades of experience, transparent pricing, and exceptional customer support, we make it easy to add peaceful, colorful species to your collection. Order online today and enjoy fast, reliable delivery across the UK.

Customer Reviews

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What customers say about ordering from us

  • 4 out of 5Verified buyer

    I have a small group of long finned mountain minnows. So was delighted to be able to order ten of this variety to increase the genetics in my tank . The ones I recieved are healthy but it’s to early to give a verdict on wether they are of a long finned type since they are small currently.

    Gordon Walker · 23 Sept 2026

  • 5 out of 5Verified buyer

    100% success travel and "installation". Pleased with quality of purchase. The Siamese fighter a bit "shy" so have not yet seen him at his best yet but looking good. Happy customer. GG

    George E Garratt · 21 Sept 2026

Reviews of our shop, collected by Judge.me, an independent third-party review collector. Newest first.