Seachem Flourite Black Sand – 15.4 lb Planted Aquarium Substrate

The Premium Substrate for Planted Aquariums

Seachem Flourite Black Sand is a specially fracted, stable porous clay gravel designed to create a natural, visually striking planted aquarium. Its deep black, matte finish provides a rich backdrop that makes greens and other plant colors pop while delivering a balanced, natural look for the tank interior.

While its appearance shines in planted setups, Flourite Black Sand is versatile enough for use in other aquarium environments. Its earthy tone and uniform texture help create a cohesive foundation for aquascapes where roots can anchor and aquatic life can thrive without compromising aesthetics.

Importantly, this substrate is not chemically coated or treated, and it will not alter the water’s pH. That means you can enjoy a stable, predictable base as you cultivate your aquascape, without unexpected shifts in water chemistry.

Designed as an integral substrate bed, Flourite Black Sand is built for lasting performance. It remains effective for the life of the aquarium, and it does not require replacement or routine gravel modifiers to stay functional.

Benefits at a Glance

• The Premium Substrate for the Planted Aquarium
• Specially Fracted, Stable Porous Clay Gravel For The Natural Planted Aquarium
• Its appearance is best suited to planted aquaria, but may be used in any aquarium environment
• Never Needs Replacement And Remains Effective For The Life Of The Aquarium
• Not Chemically Coated Or Treated And Will Not Alter The Ph Of The Water
• Gravel modifiers such as laterite are not necessary

Usage and Setup Ideas

In real-world tanks, Flourite Black Sand’s dark, velvety finish helps plants, fish, and invertebrates stand out, while the porous clay structure supports gentle water flow through the bed. The natural look is well-suited to aquascapes that mimic riverbeds, soil pockets, or wilderness-inspired layouts, offering a timeless foundation for growth and color.

The bed is designed to be used as a standalone substrate or mixed with other gravels to create layered textures and tones. Because it does not rely on chemical coatings or added modifiers, many hobbyists appreciate the straightforward setup process and the consistent aesthetics it provides as tanks mature.

• Use Flourite Black Sand as the primary substrate bed for a focused planted-aquarium look
• Mix with other gravels to introduce depth, contrast, and layered color
• Leverage its non-coating property to maintain stable water chemistry without extra additives