WIO Black Venom Boulder Nano Stone brings drama, elegance, and striking contrast to your scape — smooth, pitch-black igneous boulders with a glazed surface and maze-like texture, perfectly scaled for nano compositions that command immediate attention.

Black Venom Boulder Nano Stone carries the same smooth, black-glazed character as the full-size Black Venom Boulder — a vibrant pitch-black igneous rock that mesmerizes with its dark depth and maze-like surface texture. Its rounded boulder form creates a calmer, more organic presence than the angular Black Venom Stone, making it ideal for Ryoboku-style nano layouts and any composition that calls for dark elegance with natural flow.

The stone's color deepens from dark grey when dry to vibrant pitch-black when submerged, creating a dynamic visual element that magnifies the green of plants and mosses. Sized between 3 and 10 cm, ideal for nano tanks under 40L. The stone may raise pH and hardness slightly; regular water changes are enough to keep hardness under control.

Key Points

• Color: Dark grey dry; vibrant pitch-black when submerged
• Nano Scale: Sized 3–10 cm, ideal for tanks under 40L / 10 gal
• Boulder Shape: Smooth rounded forms with maze-like glazed surface
• High Impact: Stunning contrast with green plants and pale substrates
• Pre-Washed: Clean and ready to use, no soaking required
• Water Chemistry: May raise pH and hardness slightly
• Versatile Use: Ideal for aquariums, terrariums, and paludariums
• Safe for fish, shrimp, and amphibians
• Pairing Tip: Combine with Heaven Sand for striking pale contrast

Characteristics

• Type: Igneous stone (rounded/boulder form)
• Color: Dark grey dry; vibrant pitch-black underwater
• Texture: Smooth with maze-like glazed surface
• Stone size: 3–10 cm
• Water Hardness: May raise pH and hardness slightly; regular water changes maintain stability

Availability at Cuboid Nature Aquarium

• 2 kg Bag: Assorted mix of rounded boulders, 3–10 cm

Usage

• Rinse briefly before use to remove any transport dust — pre-washed and ready for direct placement
• Use larger boulders to anchor dark focal points; blend smaller pieces near roots or moss for natural rhythm
• Place over substrate or WIO LandForms — avoid direct contact with glass
• Use WIO ScapeBound to secure if stacking or layering
• Ideal for Ryoboku-style nano layouts and dark-themed compositions
• Control any alterations in pH and kH by regular water changes with osmotic or soft water
• Safe for fish, shrimps, and other aquatic animals

Available from Cuboid Nature Aquarium — Authorized Retailer for WIO.