Seachem Onyx Sand – 7.7 lbs

🪨 Seachem Onyx Sand – 7.7 lbs

Description: The Seachem Onyx Sand is a premium substrate ideal for planted aquariums and tanks with hard water species. This naturally dark gray to black sand is rich in carbonates, making it especially beneficial for plants that thrive in slightly higher pH and hardness. Onyx Sand is porous, long-lasting, and will not break down over time, ensuring a stable and attractive foundation for your aquascape.

Key Features

• Size: 7.7 lbs bag
• Porous substrate designed for planted aquariums
• Carbonate-rich – helps buffer pH and supports plant growth
• Natural dark coloration enhances aquascapes
• Long-lasting and does not need replacement
• Suitable for freshwater aquariums, especially with plants or African cichlids

❓ FAQ

Q: Will Seachem Onyx Sand raise pH?
A: Yes, it is carbonate-rich and may slightly increase pH and hardness, making it excellent for plants and species that prefer alkaline conditions.

Q: Do I need to rinse Onyx Sand?
A: Yes, rinse well before use to remove dust and fine particles.

Q: Can it be used with bottom-dwelling fish?
A: Yes, the fine grain is safe for most bottom feeders, though rinsing well is recommended to reduce cloudiness.

Q: Is it safe for shrimp tanks?
A: Yes, but note that it may buffer pH slightly higher than neutral.