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Seachem Onyx Sand 7 kg

Seachem Onyx Sand 7 kg

  • Well suited for freshwater planted aquariums
  • Not chemically coated or treated
  • Does not need to be replaced
In stock, only 6 left
Free shipping on orders over € 60,- within Germany
Express delivery possible
1-3 business days - order today by 12:00 (German time) and we’ll deliver tomorrow at the earliest
Quantity Unit price Saving/Piece Discount
1+
€ 
33.
90
3+
€ 
32.
50
€ 
1.
40
4%
€ 
33.
90
€ 4,84 / kg
incl. 19% VAT
plus € 5,90 Shipping
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Description

Onyx Sand is a naturally dark gray sand with a grain size of 0,5 - 2 mm, that perfectly complements and enhances the appearance of any aquarium. It provides not only iron and other minerals but supports optimal KH levels for freshwater planted aquariums. Being carbonate rich, Onyx Sand provides an advantage to any plants able to utilize bicarbonates. Although ideally suited to planted aquaria, it may be used in any aquarium environment. Onyx Sand is most effective when used alone as an integral substrate bed, but it may be mixed with other gravels. Gravel modifiers such as laterite are not necessary. Onyx Sand is not chemically coated or treated but does have a slight buffering capacity that may raise pH by 0.1 - 0.5 pH units (depending on source water characteristics). Onyx Sand is good for the life of the aquarium and need not be replaced.

To determine the number of bags required for your aquarium, please note that each bag (7 kg, 15.4 lbs) occupies a volume of approximately 4,250 cm3 (260 cu. in.). To determine your desired volume multiply tank width by length by desired depth. This bag is sufficient for about a 3.5 cm (1.5 inch) deep bed in a typical 40 L (10 US gallon) tank.

Features

  • Well suited for freshwater planted aquariums
  • Grain size 0,5 - 2 mm
  • Not chemically coated or treated
  • Does not need to be replaced

Usage

Although it is pre-washed, because Onyx Sand is a natural product, it may become dusty in transit and require rinsing before use to remove any residual dust. When adding water to aquarium, fill slowly to avoid disturbing Onyx Sand bed. Place a bowl in the aquarium and add water directly to the bowl, allowing water to overflow softly on to the gravel bed. Initial cloudiness is normal. To remove cloudiness, use mechanical filtration (such as filter floss). Clarity clearing.

Content

  • 7 kg

Seachem

Seachem

Seachem is a renowned manufacturer of aquarium fertilisers and water conditioners. For over 40 years, hobbyists and professionals have benefited from the innovative products. A wide range of aids such as Seachem Purigen or Seachem Matrix ensure crystal-clear water in the aquascape. Biological water conditioners for the aquarium are also offered with products such as Seachem Stabilty are also offered.

Manufacturer information

Manufacturer
Name Seachem Laboratories Inc.
Street Seachem Drive 1000
City GA 30650 Madison
State Wisconsin
Country Vereinigte Staaten
Website www.seachem.com

Responsible person
Name E.A. European aquaristics GmbH
Street Deichstraße 189
City 27804 Berne
State Niedersachsen
Country Deutschland
E-mail info@europeanaquaristics.com
Website europeanaquaristics.com

General information

Item no.
129.0045.01
EAN 000116350501
Weight 7,00 kg
Shipping weight 7,50 kg

Questions and answers about Seachem - Onyx Sand - 7 kg

Do you have questions about this product? Ask other customers or our support team!

Hello, what grain size does the sand have?
Translated from German
Frank S.
Oct. 2025
Sven Breitenbach
Oct. 2025
Support
The grain size of Seachem Onyx Sand is 0.3–2.0 mm.
Translated from German

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