Help with whatever this is

Ladyocto

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Hello Everyone!
Not sure if this is the right spot to post this as I don't have a reef tank, just saltwater, so I hope this is an okay spot to post and if it's not I apologize.
So I've had this stuff growing in my tank for a little while and at first it was just a tiny patch and I didn't think much of it, but now it's starting to spread. Any ideas on what it is? I've been looking online and found suff that's similar, but nothing that I feel is an exact match. The closest I've found is that it might be some kind of Hydroids?

20240312_101147.jpg 20240312_101211.jpg
 

Crabs McJones

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Yup, hydroids. They tend to die out as a tank gets older and matures
 
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ISpeakForTheSeas

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Yeah, definitely hydroids:
I've heard smothering the hydroids with kalk paste may work, but here are some other threads with suggestions that might be helpful:
Edit: A relevant link in post 7 of the link above:
 
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Ladyocto

Ladyocto

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Oh crud . I probably should have been expecting it because my tank isn't quite a year yet, but I had been very fortunate for months without any issues like this. I have been adding a lot to my tank recently though so I'm guessing that's where they came from. Thank you both @ISpeakForTheSeas @Crabs McJones very much for the response and thank you @ISpeakForTheSeas for the links!
 
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Good trouble: Have mushrooms ever become pests in your aquarium?

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