The Planted Tank Forum - View Single Post - Are these rocks safe for a planted tank?

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post #28 of (permalink) Old 02-11-2013, 05:06 AM
lochaber
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Join Date: Jan 2012
Location: Oakland, CA
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huh, maybe they are excavating inside.

http://en.wikipedia.org/wiki/Manhattan#Geography

Sounds like it might be what you found.
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