Id please
 

So I was moving some coral around that was unhappy and I came across this, what is it? Good bad or....? It has some sweepers that come out, it seems to annoy my leather finger, but I had it in a bad place as well so he is not happy at the moment. https://uploads.tapatalk-cdn.com/201...b4e920c1eb.jpg

Not a clue as to what it was, but the leather is much happier with it gone.

It's a tunicate/sponge. I've seen that type quite often in one client's tank, though I've never tried to ID it.