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#6
07-31-2010, 03:57 AM
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It could be a worm that made that there are some worms that use their spit to make tunnels bonding grains of sand together. They can also adhere rock to one another so they do not move easily I have some but I have never seen any thing like that in my tank. I do know that when I change mt aqua scape some of the rocks are stuck together.
Bill 
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