06-14-2010, 03:34 PM
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Adding anything found on the beach to your tank is asking for trouble. Pollution levels on beaches is known to be high, even in less populated areas because the tides and currents wash that stuff up. Collectors go miles out to sea to collect animals, sand, and rock for that reason.
Another issue with adding something from the beach to one of your tanks is illness, parasites, and other forms of disease. Rock can bring in a lot, so can sand.
If you add these things to your tank, expect to have problems that I may not be able to help you resolve. Very bad idea... best thing to do would be to return it where you found it and break down your QT tank, sterilize it with bleach water (and everything in it), let it air dry for a couple of days, and start it over again.