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sorry if this is stating the obvious, but are you sure this is not a Valonia algae ball? It looks like it to me form the pic. They are very common in your waters too. I have had some that were fully as large as 2"/5 cm in diameter... and many that were quite tiny, too.
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
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