WIO Nano Boulder - Black Venom

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.

Inventory Accuracy

If this item is at low stock, or you are ordering all or almost all of our current inventory, there may be an inventory discrepency. We will contact you about any issues as soon as possible.

Order Processing

  Please allow 24 to
48 hrs to process your order.  Expect an
email within 48 hrs to let you know your order is on your way.

Store Pickup

  If you choose “Pickup
in Store” at checkout, an email will be sent when your order is ready for
pickup.  Orders can be picked up during
store hours, see our home page for our current hours.  The pick up address is 6637 Easton Rd,
Pipersville, PA 18947

Domestic Shipping Rates

  Shipping charges, if
any, for your order will be calculated and displayed at checkout.