![]() But make sure you read the label carefully. Dolomite sands are the exception, of course. And since they’re abiotic (made without the presence of live animal parts), your tank doesn’t gain as much benefit from these aquarium sands. It’s possible to have oolite made from phosphate, hematite, or dolomite. They form WITHOUT those calcium carbonate shells you see in aragonite aquarium sand.īecause the term “oolite” refers to size and shape, it doesn’t hurt to check the label of the substrate you’re planning to buy (especially if you’re buying from a non-aquarium hobby source) to confirm the chemical composition. This means oolitic aquarium sand is composed of tiny egg-shaped or spherical grains. By definition, oolites MUST be less than 2mm in diameter. Oolite forms from ooids (shown in the picture below), spherical sand grains formed in concentric layers. ![]() The term “oolite” refers to the way the sand forms.
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