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I believe I have the same thing in my tank, never seen it before either. I have had it in my tank for a little over a year now. It Grows on the underside of rocks and pokes string like arms towards the light. The "tentacles" started off short and have since grown to several inches in length. Whatever it is it seems harmless. I increased the frequency of my water changes, this seems to have slowed the growth. I also pulled some of it out by hand.
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