Help, aliens in tank

PatrickStarfish

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what are these, there's like 50 to 100 of them..are they harmful? they are on the glass and in the sump. Thanks alot

20210502_193644.jpg
 
Pineapple sponges. Don't worry about them; harmless and self regulating.
 
first i thought pods because the pic is unclear…
but those are pineapple sponges, i think.
just part of a maturing tank
 

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