Black Marble Swordtail

Black Marble Swordtail - Striking Black Marbled Pattern

The Black Marble Swordtail displays a bold black marbled pattern swirling across its body, with each fish carrying a slightly different arrangement of markings.

It's every bit as hardy and easy to keep as other swordtails, reaching up to 12 cm including the sword, and males should be kept with two or three females to minimise sparring.

At N8 Aquatics, our fish are carefully raised and conditioned to ensure healthy stock suited to home aquariums.

Species Snapshot

• Adult Size: Males 10–12 cm including the sword, females slightly shorter
• Tank Size: 80 L minimum
• Temperament: Generally peaceful; keep one male per 2–3 females
• Temperature: 22–27°C
• pH: 7.0–8.0
• Difficulty: Easy

Ideal Habitat and Care

Swordtails appreciate a longer, well-planted 80 L or larger aquarium with open swimming space; because males can spar over females, keep a ratio of one male to two or three females.

• Temperature: 22–27°C
• pH: 7.0–8.0
• Water Flow: Moderate
• Maintenance: Weekly partial water changes to maintain stable, clean water

Diet

Swordtails are easy-to-feed omnivores that appreciate a varied diet.

• High-quality flake or pellet food as a dietary staple
• Vegetable matter such as blanched zucchini or spirulina flake
• Occasional frozen or live foods for variety and conditioning

Compatibility

Swordtails are generally peaceful community fish that mix well with a range of similarly sized species.

Suitable tankmates include:

• Platies
• Mollies
• Tetras
• Corydoras and danios

Avoid aggressive or fin-nipping species.

Why Buy From N8 Aquatics

• Carefully raised aquarium fish
• Healthy, well-conditioned stock
• Strong genetics and vibrant colouration
• Breeder support if you have questions

Pickup Information

N8 Aquatics currently operates as a local pickup-only breeder in Central Queensland.

Orders are collected by appointment after purchase confirmation.

Please ensure you are able to collect your fish before placing an order.

Important

All livestock sold by N8 Aquatics should be introduced to fully cycled aquariums suitable for the species being kept.

Please ensure your aquarium setup and tankmates are appropriate before purchasing.