Seachem Flourite Black Sand — 15.4 lb Planted Aquarium Substrate

Overview

Seachem Flourite Black Sand is a natural, aesthetically rich substrate crafted from specially fractured, stable porous clay gravel. Designed with planted aquariums in mind, its deep black color provides a neutral stage that helps greens and colors stand out while offering a micro-structure that plant roots can explore. The material is not chemically coated or treated and will not alter the water’s pH, making it a calm foundation for a variety of freshwater setups.

Why it works well in planted tanks

For natural aquascapes, a dependable substrate is essential. Flourite Black Sand can serve as an integral bed on its own or be blended with other gravels to create depth and texture. Its porosity supports root zones and microhabitats without introducing unwanted compounds, and its stability helps maintain a consistent look over time.

• Specially fractured, stable porous clay gravel that remains consistent as the tank matures
• Appearance suited for planted aquaria yet versatile enough for other environments
• Long-lasting performance—remains effective for the life of the aquarium
• Not chemically coated or treated and will not alter the water pH

Usage and aesthetic notes

Use Flourite Black Sand as a complete substrate bed to anchor roots, or mix with other gravels to add texture and contrast. The natural, matte black grain provides a backdrop that helps plant colors pop and offers a soft, realistic riverbed look. The stone-like texture supports gentle flow and gas exchange at the root zone, while staying visually calm under lighting.

• Complete substrate option for a cohesive planted display
• Mixable with gravels to create varied layers and visual depth

Pack details

Each bag contains 15.4 pounds of Flourite Black Sand, ready to form a natural, plant-friendly substrate for freshwater aquariums. Its inert composition helps preserve a stable environment without the need for additives or modifiers.