Are these Hydroids?

[DragonWrasse103]

About a year ago I added piece of live rock to my mixed LPS/SPS reef tank that had a patch of very small polyps. I didn't pay too much attention to them at first, but over time they have covered several rocks and have covered a large portion of my back wall. I've done several searches but have not found picture that or description that matches. Any help identifying this and recommendations for removal and/or control?

 

[Cnidoblast]

Sarcothelia

Panacur might be of help

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

 

[flsalty]

Looks like some type of clove polyps or similar octocoral.

 

[DragonWrasse103]

Thanks for the replies. Cnidoblast - It does look like Sarcothelia. I'll do some reading on using Panacur, but I'm concerned what impact it may have on other soft corals and invertebrates in my tank. Do you have any experience using this treatment? I have several zoanthid colonies, a palythoa grandis, bubble tip anemones and multiple other LPS and SPS corals. Otherwise, I am planning to scrape and siphon off the back wall and remove the rocks with the most coverage and try and cover other areas with kalk paste or use aptasia-x.