Rocks are a nice addition to a fish tank. However, not all rocks can be used in an aquarium environment. Find out which rocks are safe and which are not.
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Rocks in the Aquarium
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Rocks in the Aquarium
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Can I put rocks I found in the river or pebbles I found on the sea into my aquarium? - Quora
The Elements of Aquascaping: Rocks, Driftwood & Substrates - Aquascaping Love