WIO - Black Venom Boulder

$9.95

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A bold, jet-black igneous stone with smooth glazed surfaces and crisp natural formations that create dramatic contrast in any aquascape or terrarium. Its deep coloration and sculptural presence make it an ideal centerpiece rock, enhancing depth, shadows, and the vibrancy of surrounding plants and hardscape.

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100% natural aquascaping rock

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Rock Sizes : Per Pound Per Pound 4.4 lb Nano Bag 46 lb Mega Box

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Details

Color: Deep grey to jet-black tones with a glossy, polished appearance that intensifies underwater.

Stone Type: Igneous volcanic rock with naturally formed internal patterns and smooth outer surfaces.

Texture: Smooth, glazed texture with subtle natural formations that catch light and enhance contrast.

Matching: Perfect with Heaven Sand, fine gravels, mosses, and driftwood for high-contrast, cinematic scapes.

Results: Creates bold, dramatic layouts with strong depth, clean shadows, and striking black-on-green contrast.

Ready to Use: Rinse thoroughly; brush off dust; place over substrate or LandForms; secure stacks with ScapeBound.

Safety: May slightly raise pH and hardness; fully safe for fish, shrimp, plants, and terrarium species when monitored.

Worry-Free: Color-stable, composition-stable, aquarium-safe, and ideal for both CO₂ and low-tech setups.

Versatile: Excellent for aquariums, terrariums, paludariums, Iwagumi, and modern minimalist hardscapes.

SHIPPING INFO

Fast and free shipping within the U.S. and Australia.

Worldwide free shipping on orders over $599!

CARE INSTRUCTIONS

Water hardness: May raise pH and hardness slightly.

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Fast and free
100% natural aquascaping rock
24/7 support
Over 100,000 happy aquariums

Black Venom Boulder Boxes

Our Boulder Boxes are complete, hand-curated sets designed to make professional-grade aquascaping effortless. Each box captures the wild elegance of nature’s stone formations — no two sets are ever the same.

Available Sizes:
Mega Box – 46 lb (21 kg) – Ideal for 2'–4' (60–120 cm) aquariums
Nano Bags – 4.4 lb (2 kg) – Smaller pieces for nano tanks
Available per pound too

Why You’ll Love It
✓ Vibrant jet-black coloration that pops underwater
✓ Smooth glazed surface with intricate natural patterning
✓ Complements greenery, mosses, and driftwood beautifully
✓ Enhances depth and contrast for dramatic scapes
✓ Ideal for both aquariums and terrariums

Design Tip
Pair Black Venom Nano Boulders with Heaven Sand and fine gravels for layered, high-impact compositions. Tilt and stack stones at varied angles to mimic natural erosion for a cinematic, textured layout.

Specs & Care
Stone Type: Igneous
Color: Deep grey to pitch-black underwater
Texture: Smooth surface with intricate natural formations
Size Range: 2"–15" (5–38 cm)
Effect on Water: May slightly increase pH and hardness
Rinse thoroughly before use. Place stones over substrate or LandForms for stability. Secure stacked rocks with ScapeBound adhesive. Leave space from glass panels for easier maintenance.

Safe for all fish, shrimp, and plants.