🐠 Black Calvus – Juvenile Pair Pack (2 Fish)

Altolamprologus calvus (Black variant) | Elite Lake Tanganyika shell/rock predator with compressed body and stealth hunting behavior

Add rarity, elegance, and precision predator intelligence to your aquarium with Black Calvus — one of the most refined and sought-after Tanganyikan cichlids. Known for its extremely laterally compressed body, slow deliberate movements, and jet-black coloration, this species is a true specialist in rock and shell habitats.

✨ Why aquarists love Black Calvus

✔️ Deep black body coloration — premium ornamental appearance
✔️ Ultra-compressed body shape — adapted for tight rock crevices
✔️ Stealth ambush predator behavior — slow, precise hunting style
✔️ Highly intelligent movement patterns — calculated and observant
✔️ Collector-grade Tanganyikan species — rare and specialized cichlid

📦 What you receive

• 2 × Black Calvus Cichlid
• Size: Fry (1.5 – 2 cm)
• Carefully selected from stable, healthy batches

🌍 About the species

Altolamprologus calvus is native to Lake Tanganyika and is closely related to compressiceps-type cichlids, but with a more refined head shape and slower, more deliberate hunting behavior.

These fish are known for:

• Extremely compressed body for rock crevices
• Slow, calculated ambush hunting strategy
• Shell and rock-based territorial behavior
• Strong visual awareness and patience-based feeding
• High adaptability to structured biotopes

They are among the most specialized cichlids in the aquarium hobby.

🏡 Ideal aquarium setup

Black Calvus thrives best in:

• Lake Tanganyika rock and shell aquariums
• Dense stone structures with narrow caves
• Sand substrate environments (important for shells)
• Hard, alkaline, stable water conditions
• Moderate flow with high oxygenation

Recommended setup:

• 100–150 liters or larger
• Shell beds + rock formations
• Multiple hiding crevices
• Stable water chemistry (alkaline preferred)

⚠️ Compatibility notes

Black Calvus is a specialized ambush predator, requiring careful stocking.

Not ideal with:

• Very small nano fish (may be predated)
• Fry or shrimp
• Weak or slow ornamental species
• Overcrowded community tanks

Best suited for:

✔️ Tanganyikan shell/rock biotope tanks
✔️ Predator-focused cichlid setups
✔️ Advanced aquarists
✔️ Structured aquascapes

🚚 Professionally packed for live arrival

Every shipment is treated as a live biological transport, not a standard parcel.

Your fish are packed using:

• Oxygen-filled fish bags
• Temperature-insulated packaging
• Shock-absorbing thermocol protection
• Fastest safe transport routes available

This minimizes transit stress and improves live arrival success.

🛡️ Live Arrival Guaranteed*

Instant Refund or Full Replacement for DoAs in accordance with our Refund Policy.

👉 You are not taking the risk alone.

💰 Total Delivered Price: ₹1,499/-

No hidden charges.
No surprise shipping fees.
The displayed price is the final delivered price.

🧠 Why is this priced at ₹1,499/-?

Unlike conventional aquarium stores, we do not price livestock only by “per fish” cost.

This pricing includes the entire safe delivery ecosystem, including:

• Fish value and batch quality
• Oxygen packing and insulation materials
• Specialized live-animal packaging
• Express transport logistics
• Mortality risk management

In many cases, shipping and packaging alone exceed ₹600 per order.

👉 This approach ensures every shipment remains ethical, viable, and survival-focused.

🧭 Is this right for you?

✔️ You want rare elite Tanganyikan predators
✔️ You enjoy stealth and ambush behavior observation
✔️ You are building a rock/shell biotope aquarium
✔️ You prefer advanced, specialized cichlids

⚠️ Not ideal if:

• You want peaceful community fish
• Your tank is small or unstructured
• You keep nano fish or shrimp
• You prefer fast schooling species

🔬 Nero Labs Standard

These fish are maintained with:

• Controlled batch monitoring
• Observation-based selection
• Stress-aware handling
• Survival-focused transport preparation

We prioritize long-term stability and health over bulk-volume movement.

👉 Add elite stealth predator behavior to your aquarium

Experience the rare morphology and calculated hunting style of Black Calvus from Nero Labs.

Black Calvus (Altolamprologus calvus)

Description

The Black Calvus (Altolamprologus calvus – black morph), offered by Nero Labs, is a selectively maintained ornamental Lake Tanganyika cichlid recognized for its laterally compressed body form, deliberate predatory behaviour, and deep charcoal to jet-black coloration. Native to the rocky littoral zones of Lake Tanganyika, this species is highly specialized for navigating narrow crevices and complex rock structures, where its compressed morphology provides a functional ecological advantage.

Body coloration presents as matte black to dark graphite, occasionally exhibiting subtle iridescent spotting or faint metallic highlights depending on lineage and lighting conditions. Finnage is proportionally elongated and refines with maturity. Behaviour is calm but distinctly territorial, characterized by slow, calculated movement patterns and ambush-oriented micro-predation. Unlike more overtly aggressive Tanganyikan cichlids, A. calvus relies on spatial dominance and stealth rather than constant pursuit or display aggression.

Individuals supplied are lab-reared and system-acclimated within controlled, closed-system environments, reducing early-life stress and supporting stable behavioural development. This lineage represents domesticated ornamental stock maintained for morphological consistency, colour stability, and aquarium suitability rather than wild ecological performance or conservation deployment.

System & Rearing Notes

Origin: In-house, Nero Labs
Rearing environment: Controlled, closed system
Line status: Selectively maintained ornamental Tanganyikan cichlid
Behaviour: Territorial, deliberate, low-activity predator
Feeding behaviour: Carnivorous micro-predator; accepts prepared and frozen feeds
Habitat preference: Dense rockwork, caves, crevice-rich structures
Swimming profile: Bottom to lower-midwater, structure-associated
Colour development: Stable; contrast and finnage refine with maturity and low stress

Minor variation in body depth, spotting intensity, and fin proportions may occur between individuals and reflects normal biological diversity within maintained ornamental populations.

Availability & Use

Availability of Black Calvus is cycle-dependent and aligned with biological readiness rather than commercial inventory targets. This species is recommended for intermediate to advanced aquarists experienced with Lake Tanganyika water chemistry and territorial cichlid management.

Best suited for Tanganyikan biotope aquaria, rock-dominated systems, and carefully structured mixed-species displays with compatible, non-aggressive tankmates.

Important Note

Black Calvus require structurally complex environments with abundant vertical rock surfaces and narrow shelters. Inadequate habitat structure or incompatible tankmates may lead to chronic stress or suppressed natural behaviour. Feeding strategies should account for their slow, deliberate feeding response.

Ethical & Operational Context

Distribution of Black Calvus through Nero Labs prioritizes organism welfare, behavioural stability, and closed-system integrity. Proceeds support continued refinement of Tanganyikan husbandry protocols, behavioural research, and applied ornamental aquaculture initiatives.