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What is this growing in my tank?

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It’s not a fungus.  That’s a Bryozoan, sort of like a very tiny tube worm type organism that’s a filter feeder.  They are not harmful at all, but they can overrun a tank a bit if they really like the conditions.  They should be easy enough to remove/scrape off things if you don’t like them but they’re considered a sign of a good ecosystem.  Congratulations are in order as long as you like them.

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