WIO Lunar Eclipse Boulder Stone Kit brings a unique dimension to aquascaping — these specially cut boulders feature a flat base that allows them to be placed directly on the aquarium floor, creating the stunning illusion of a submerged boulder with only its rounded top breaking the surface. The result is an instantly convincing riverscape or shallow biotope, more natural and immersive than conventional hardscape placement.

Lunar Eclipse Boulders are dark and dramatic, with cool shades of black and deep grey that command attention under aquarium lighting. The flat-cut face reveals subtle layered striations in charcoal and slate, while the natural exterior surface carries the golden-brown weathering of a river stone with centuries of character. This contrast between the dark polished interior and the warm-edged exterior gives each piece extraordinary visual depth.

Position the main boulder slightly off-center on the tank floor and allow substrate to lap naturally around its base; the flat bottom eliminates rocking and keeps the piece stable. Pair with pale sands to make the dark tones sing, or use with darker substrates for a dramatic, tone-on-tone composition. Lunar Eclipse complements its warm counterpart, the Solar Eclipse Boulder, for a stunning light-and-dark pairing.

Key Points

• Flat-cut base allows placement directly on aquarium floor — creates a convincing submerged boulder effect
• Ideal for shallow river biotopes, streamscapes, and high-contrast Iwagumi layouts
• Cool black and deep grey tones with subtle charcoal striations on the cut face
• Natural exterior carries warm golden-brown weathering for striking contrast
• Pairs with Solar Eclipse Boulder for dramatic light-and-dark compositions

Characteristics

• Type: Sedimentary stone (flat-cut boulder)
• Color: Black and deep grey with golden-brown weathered exterior
• Texture: Natural rugged exterior with smooth flat-cut base revealing layered striations
• Stone size: Typically 10 to 30 cm
• Water Hardness: May raise pH and hardness slightly; regular water changes maintain stability

Availability at Cuboid Nature Aquarium

• Box — 10 kg (22 lb): WIO's curated size mix, hand-selected assortment of stones
• In-Store: Visit us in Pipersville, PA to hand-pick individual stones by the pound — choose exactly the pieces and sizes you want for your layout

Usage

• Suitable for both aquatic and terrarium environments
• Place flat base directly on aquarium floor or substrate for a natural submerged boulder effect
• Rinse rocks and stones with water before use; use a brush to clean before introducing to the aquarium
• The flat base provides stability — no need for additional cushioning or adhesive for most placements
• Position stones a few centimeters/inches away from aquarium glass walls to facilitate maintenance
• Control any alterations in pH and kH by regular water changes with osmotic or soft water, or by using a water softener if necessary
• Safe for fish, shrimps, and other aquatic animals

Available from Cuboid Nature Aquarium — Authorized Retailer for WIO.