Fuzz On Tank Decor?

Nightshadethebetta

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I was checking out my fish today and saying hi as usual But I noticed on only this one piece of decor, there is some kind of fuzzy stuff on it? It’s super hard to get a picture of it, but if you look closely, you can see it. I have one Betta in a 2.5g heated tank. I do water changes once a week and I just changed it this Monday. My fish isn’t acting any differently, he’s healthy. Is this fuzz something to worry about? Thanks!!
 

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Demeter

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Looks like diatoms, a common occurrence in newly established tanks. You can scrub it off if you'd like, but I see know harm in leaving it be.
 
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