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All of the species of blue-ring are about the same size - 4-5 cm mantle length. They all are fairly accomplished at camouflage. That is why I questioned the use of a cube. We keep our blue-rings in simple sealed glass cubes with only a thin layer of sand and a piece of pvc to hide in. Filtration is via canister filter and the water outlet is sealed and filtered with foam. There is no way in or out of tank unless we remove the glass lid.
Roy
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