This is a natural river gravel which does not raise the hardness of the water. By mixing different sizes based on your aquarium, you can make the layout look more natural. The smallest size, S size can be also spread directly on the aquarium and used as base sand. (Usable for bottom filter)
The Aqua Gravel in size S has a grain size of about 2-5 mm.
Rinse well before use.
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