Seachem Onyx Sand LIGHT or any other purpose they

or any other purpose they are made to fit your application

an external filter

The calcium-bearing component of a two-part method for dosing calcium and carbonates (the substances largely responsible for increasing alkalinity (”buffering capacity”)) in the same ratio as that found in natural seawater

Advanced Instructions and Guidelines:

Neither NanoCode contains organic components such as vitamins

Seachem Onyx Sand LIGHT or any other purpose theyPremium natural sand for the planted aquariumGood for the life of the aquariumSupports optimal KH levels for freshwater planted aquariumsRich in carbonates Onyx Sand is a naturally dark gray sand that perfectly complements and enhances the appearance of any aquarium. It supports optimal KH levels for freshwater planted aquariums. Although ideally suited to planted aquaria, it may be used in any aquarium environment. Onyx Sand is most effective when