Talk with the Expert | International and European shipping | Free Shipping for Orders over 69€ | Shipping within 24 hours
ONYX SAND 7 Kg – Porous Natural Substrate Rich in Carbonates for Freshwater Planted Aquariums
Onyx Sand 7 Kg is a high-performance natural substrate made of structured, porous clay, specially formulated for planted freshwater aquariums. With a naturally dark appearance and rich carbonate content, it provides essential benefits for plants that absorb bicarbonates—especially carpeting species and nutrient-demanding varieties.
Its porous texture promotes strong root development and nutrient absorption. Onyx Sand works exceptionally well as a standalone substrate but is also compatible with other base layers. Unlike competing products, it requires no additional fertilization or laterite and is chemically stable—meaning it will not alter the water’s pH or release harmful substances.
Although pre-washed, a light rinse is recommended before use to remove dust residues. Any initial cloudiness clears within 2 to 12 hours. Onyx Sand remains active and effective throughout the entire life of the aquarium without needing replacement.
Main features:
Natural clay-based, porous structured substrate
Rich in carbonates, ideal for bicarbonate-absorbing plants
Dark, natural appearance perfect for planted tank layouts
Chemically inert and pH neutral
Does not require base fertilizer or laterite
Long-lasting, never needs to be replaced
Suitable for all freshwater aquascapes
Compatible with other substrates if needed
Pre-washed; rinsing recommended before use
Temporary cloudiness clears within a few hours
Why choose Onyx Sand 7 Kg:
Onyx Sand is the ideal solution for aquascapers and plant lovers looking for a nutrient-rich, durable, and aesthetically pleasing substrate. It supports healthy plant growth while maintaining long-term substrate stability with minimal maintenance.
English 
Italiano 
