Hydroids ???

[Vincent100]

Anyone know if this are hydroids and are the type that need to get out of my tank asap
Pic is not good at all as I had to take it looking through a hole in the rock ....most awkward place they could be lol

 

[tankaholic]

do they look like this?? someone told me these are hydroids...

 

[Vincent100]

No mine are different from them
Sort of remind me of yellow palys in a way

 

[Vincent100]

I should point out that I'm talking about the things in the center of the pics

 

[Bongo Shrimp]

Yes, they are hydroids and they may or may not become a problem. You can try to cut the colony off the rock by cutting below it, or you can try smothering them in super glue. I have had them in one of my tanks for years and they have never become a problem.

 

[Vincent100]

Thanks bongo
Might try covering them in reef putty

 

[Bongo Shrimp]

Thanks bongo
Might try covering them in reef putty

That would likely do the trick.

 

[AdamNC]

I have a few in my tank in one spot. They don't seem to spread so I just leave them be. Like yours they are kinda of a greenish/yellow.

 

[Vincent100]

Just found these on a rock from my sump
Hydroids???????
I'm going abit hydroid OCD
@Lionfish Lair

 

[Lionfish Lair]

What happens when you touch them? Anything?

 

[Vincent100]

What happens when you touch them? Anything?

Hi lionfish
They close up into their little tube

 

[Lionfish Lair]

They're probably just little feather dusters.

 

[Lionfish Lair]

You might want to make sure the stuff in the upper left corner is just algae.

The very first pictures... those could be hydroids.

 

[gig 'em]

Definitely look like hydroids to me. Whenever I see them on a new rock I will cover them in super glue and that takes care of them assuming I get them all covered.