That's weird. And you have no fish or shrimp, right? So you haven't been feeding anything.....hmm. Try to pick it out or siphon it out (airline works good for small tanks, but you'll have to start the siphon yourself by sucking on the end.......). Hopefully it won't come back, whatever it is.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 10g, 5.5g
10g N. multifasciatus tank, 5.5g Platy fry
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