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Completely inert rocks are generally produced from volcanic origins. They include granite, quartz, basalt and many semi precious gemstones such as amethyst and citrine. Slate is another inert rock though this is sedimentary in origin. All of these make excellent aquarium ornaments.
http://www.e-aquarium.com.au/rock-aq...-ornaments.htm |
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Using rock will reward you with unique natural decorations for use in the aquarium. Commonly acquired stones are generally non-toxic to fish,
but can dissolve to increase pH and hardness. This article will help you choose the correct rocks for fish tanks.