Help with whatever this is

[Ladyocto]

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?

 

[Crabs McJones]

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

 

[ISpeakForTheSeas]

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:

Hydroids: a reference to some strategies

Like many of us, I have had problems on and off over the years with Hydroids. The ones that have always given me the most problems are the common ones that almost look like a smaller and darker version of the beginner coral called Yellow Polyps. But the colonial Hydroid is much smaller than...

www.reef2reef.com

Hydroids - How do I eliminate- They have taken over my tank

So I have this stuff that has pretty much taken over my tank and I can't get rid of it. I'm looking for an ID and an eradication plan that is anything short of a total teardown.

www.reef2reef.com

Fenbendazole dip for blue clove polyp/hydroids.

FYI So I had more than few blue clove and what i believe are hydroids pop up on a few frags and start spreading in the frag system. I didn't want to start out treating the whole system so I picked the most populated frags to treat. I mixed 1/4 gram of Fenbendazole with 1 cup of saltwater as a...

www.reef2reef.com

Edit: A relevant link in post 7 of the link above:

Here it is! Fenbendazole use against hydroids

Hi all! Well after getting a lot of questions about the use of fenbendazol I figured I would write this up. This is for informational purposes and I will not be held liable for improper use. Fenbendazol must be used exactly as I instruct or run the risk of a tank crash. Now lets get to it! So...

www.reef2reef.com

 

[Ladyocto]

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!