A 1 hour air bath will kill a tunicate then.zoa will be fine.

Try just pulling with tweezers. Tunicates and sponges are delicate, hydroids have a surprisingly tough tube. If they are just dead hydroid tubes, there is no need to remove them unless you find them unsightly. If they were live hydroids they would be stinging the poop out of the Zoas.

Sorry how do these things spread and keep growing if they're dead lol. I scraped them all off if they come back as I know I missed some it will be time for some oxygen therapy.

Thank you for all the info.

Clavalina sp. hard to find info on these though:smile:

They are spreading? Oh. Hmm. They just don't look like sponges or tunicates to me. Oh well, good luck with the air bath.

If all I had seen was the top of that plug I would have said hydroids as well, but when you look at the bottom of the plug you can see more tendrils that are half forked wrapping around and down. That looks just like one of the kinds of sponge I've seen dozens of times in my tank, usually in the sump where there's never any light, and the tubes sticking up above the polyps are consistent with the vents of that kind of sponge.

When the zoas are closed up for the night, can you see more white stuff in between them? If so it is that sponge, and simply removing the tube vents won't be enough, you'll have to scrape the entire body of the sponge from the plug or it will just keep growing back.

Yup scattered all throughout the single polyps while closed, I'm pretty sure they're some type of sponge!