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What is this fluffy stuff on the walls of my Betta tank? It's so creepy it's making my skin crawl.

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I cannot see it very well(bad eyes) but it is most likely bacterial colonies, biofilm, or the beginning of algae.  All very common in a new aquarium.  Once it settles and all your good bacteria colonize and populate in mass quantities it will dissipate if it is biofilm/ colonies. You can just wipe it off. I have seen similar things in new tanks. No worries it’s part of the journey.

Add on…great last pic it came through just as I sent my reply. 

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