Round filter grids of 45 mm in diameter are often used on aquarium backgrounds and decorations to allow for the water flow. There are standard White and Brown colours available as well as the colours of your ARSTONE background or rocks – Basalt Gneiss, Alpenkalk, White Limestone and Grey Gneiss.
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Basalt Gneiss, Grey Gneiss, Alpenkalk, White Limestone, Brown, White
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