WIO Nano Boulder - McDonald Lake

WIO McDonald Lake Boulder Nano Stone brings rare multicolored character, geological wonder, and a striking natural riverbed impression to your scape — colorful sedimentary boulders with colors ranging from dark red to maroon, and from green to blue and black, perfectly scaled for nano compositions.

McDonald Lake Boulder Nano Stone carries the same rare, multicolored character as the full-size McDonald Lake Boulder — a unique natural mix of stones from different origins whose vivid colors owe their character to the iron content in sedimentary pebble rocks and the degree of oxidation. Formed over millions of years and shaped into smooth pebbles by glacial forces, each piece is a miniature geological marvel. Even at nano scale, the color variety creates an instantly captivating riverbed impression.

Sized between 3 and 10 cm, ideal for nano tanks under 40L. Some boulders may raise pH and hardness slightly; regular water changes are enough to keep hardness under control. Pre-washed and ready to use.

Key Points

• Color: Dark red, maroon, green, blue, and black — a stunning multicolored mix
• Nano Scale: Sized 3–10 cm, ideal for tanks under 40L / 10 gal
• Smooth Boulders: Glacially shaped with natural color gradients
• Unique Riverbed Character: Natural color variation creates instant visual depth
• Pre-Washed: Clean and ready to use, no soaking required
• Water Chemistry: Some boulders may raise pH and hardness slightly
• Versatile Use: Ideal for aquariums, terrariums, paludariums, and bowls
• Safe for fish, shrimp, and amphibians

Characteristics

• Type: Natural mix stones from different origins
• Color: Dark red, maroon, green, blue, and black
• Texture: Smooth with natural color gradients
• Stone size: 3–10 cm
• Water Hardness: Some boulders may raise pH and hardness slightly; regular water changes maintain stability

Availability at Cuboid Nature Aquarium

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

Usage

• Rinse briefly before use to remove any transport dust — pre-washed and ready for direct placement
• Arrange by color groupings or mix freely for natural variation
• Place over substrate or WIO LandForms — avoid direct contact with glass
• Use WIO ScapeBound to secure if needed
• Ideal for colorful riverbed biotopes and natural stream 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.