WIO River Kit – Rivulet

The Rivulet River Kit is a carefully balanced and visually stunning biotope inspired by the unique ecosystem of Yakushima Island in Japan — a UNESCO World Heritage Site renowned for its ancient cedar forests, crystal-clear mountain streams, and breathtaking natural beauty. Ideal for creating a pleasant, harmonious, and calming biotope environment.

At the heart of the Rivulet kit is the Elderly Stone — one of WIO’s most sought-after stones, revered for its distinctive “cracking” pattern and rugged texture that resembles ice or snow, evoking the ancient weathered boulders of Yakushima’s mountain streams. The kit includes a full range of Elderly Stone sizes from XL down to small, alongside a 2 kg bag of Elderly Nano Rocks that bring the same unique cracked character to the foreground for fine detail and natural depth. The warm Artist Mustard plant substrate — a 5 kg nutrient-rich growing medium — provides a natural golden-earthy foundation that harmonizes beautifully with Elderly Stone’s cool grey-brown tones, while the Rivulet Biotope Beds add authentic fine substrate texture.

The result is a serene, wabi-sabi landscape that radiates ancient calm — perfect for Japanese biotopes, mountain stream scapes, or any layout seeking timeless natural character and a contemplative atmosphere.

One Universal River Kit. Infinite Aquascapes.

Your WIO River Kit is the ultimate canvas for global aquatic artistry. Designed as a Universal Base, it distills the raw beauty and soul of rivers, lakes, and streams worldwide — so you can create with freedom, not limits. Craft a stunning aquascape or transform it into a lush biotope with region-specific flora, fauna, and botanicals. It’s that simple. Just boundless creativity.

Dream aquascapes or wild biotopes — achieving them has never been this simple, this versatile, this uniquely WIO.

Kit Contents (Mega Box)

• Elderly Stone: 1x XL, 2x L, 3x M, plus mix S assortment
• Elderly Nano Rock: 2 kg bag
• Rivulet Biotope Beds: 2 kg bag of natural biotope substrate
• Artist Mustard: 5 kg bag of nutrient-rich plant substrate

Key Points

• Elderly Stone’s distinctive “cracking” pattern evokes ancient mountain stream boulders
• Includes full range of Elderly Stone sizes for natural depth and wabi-sabi layering
• Elderly Nano Rocks add fine foreground detail and authentic scale
• Artist Mustard plant substrate supports healthy plant growth
• Inspired by Yakushima Island, Japan — ideal for Japanese biotopes and mountain stream scapes
• 1 kit for tanks up to 60 cm / 2 kits for tanks 75–90 cm / 3 kits for tanks 90–120 cm
• Total kit weight: 16–20 kg
• Safe for fish, shrimp, and other aquatic animals

*Pieces, colours, sizes and shapes of stones may vary. Plants not included.

Available from Cuboid Nature Aquarium — Authorized Retailer for WIO.