Seachem Onyx Sand Planted Aquarium Substrate

Seachem Onyx Sand Planted Aquarium Substrate

Seachem Onyx Sand is a natural substrate designed for use in the planted aquarium where plants are the primary focus. Its unique composition raises mineral content and slightly enriches the water — providing a beneficial mineral supplement for plants while maintaining a neutral to slightly alkaline pH. Onyx Sand has a distinct dark pebbled appearance that works beautifully in heavily planted and hardscape aquariums. Like all Seachem Flourite substrates, Onyx Sand is permanent and never needs to be replaced.

Key Features

• Naturally raises mineral content — supplements plant nutrition
• Neutral to slightly alkaline pH — suits a wide range of planted setups
• Dark, natural pebbled appearance — suits planted and hardscape tanks
• Permanent substrate — never needs replacement
• pH neutral — will not adversely affect water chemistry

Available in 7.7 lb and 15.4 lb sizes.