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Seachem Onyx Sand

SKU FB3503
€27,09
€24,63
Taxes included. Shipping calculated at checkout.
€27,09
€24,63
Taxes included. Shipping calculated at checkout.

Create a stunning, natural foundation for your freshwater tank with Seachem Onyx Sand. This premium, dark-grey natural substrate is specially crafted to support rooted aquatic plants while delivering a sophisticated aesthetic to your aquarium landscape. Rich in essential minerals like iron, manganese, and magnesium, Onyx Sand provides long-term nutrient availability without needing chemical replacement. Its fine grain structure makes it ideal for bottom-dwelling species and delicate root systems, offering a slight buffering capacity that helps stabilize pH in planted tanks.

Quick Reference & Requirements Table

Requirement / Specification Details
Available Bag Sizes 3.5 kg (7.7 lbs) and 7 kg (15.4 lbs)
Substrate Type Porous natural mineral sand / gravel mixture
Target Aquariums Freshwater planted, Cichlid, and community aquariums
Color Profile Deep charcoal to dark grey
Water Chemistry Impact Slightly raises carbonate hardness (KH) and buffers pH
Lifespan Permanent substrate (no need to replace over time)
Size
In stock 4 left

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  • 30 day free returns

Goes well with

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Our store is committed to your satisfaction. Returns or exchanges are accepted within a set period with proof of purchase and items in original condition. Some items may be non-returnable. Please report any issues promptly. For assistance, contact our support team. Thank you for shopping with us!

Return Policy

Returns are accepted within 30 days of purchase with a valid receipt and items in original condition. Custom or clearance items are non-returnable. Refunds will be issued to the original payment method. Damaged or defective items must be reported within 48 hours. For assistance, please contact our support team.

Frequently Bought Together

Total price €65,10
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Yes, and that is how our slogan sounds "You'll love coming home to our furniture". The harmlessness for our customers and their families above all for us.
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