Seachem Onyx Sand 7.7lbs

Product details

Seachem Onyx Sand 7.7lbs (3503) is a naturally dark gray sand designed for freshwater aquarium use, especially planted tanks. It functions as an aquarium substrate, helping create a carbonate-rich environment that can support stable KH and gently buffer pH. Use it as an integral substrate bed for a clean, natural look, or mix it with other gravels if you want to customize your substrate profile.

Features:

• Naturally dark gray appearance that complements planted aquascapes
• Carbonate rich, which can support optimal KH levels for freshwater planted aquariums
• Provides a slight buffering capacity that may raise pH by about 0.1–0.5 units (depending on source water)
• Not chemically coated or treated, with no added modifiers required for planted setups
• Pre-washed for convenience, but natural sand may become dusty in transit and may need rinsing before use
• Best used alone as a substrate bed, though it can be mixed with other gravels
• Initial cloudiness is normal after adding water and can be cleared using mechanical filtration

Specifications:

• Product name: Seachem Onyx Sand 7.7lbs (3503)
• Form: Natural sand substrate
• Color: Naturally dark gray
• Weight: 7.7 lbs (3503)
• Treatment: Not chemically coated or treated
• Buffering effect (general guidance): May raise pH by ~0.1–0.5 units (depends on source water)