I posted this over in another thread, but figured I should place it here as well so it would be more helpful to others.
One afternoon my son and I saw some white stuff come squirting out of one of the LR in our new tank. We could not figure out what it was, but a day or two later the Wife spotted these little guys (above and to the left of the orange Ric) hiding in that same piece of LR...
This is a photo of them with the lights out and lit with the LED on a cell phone. It is a little easier to make out their structure...
The general conciseness is that they are some type of Tunicate. They are also know as Sea Squirts. The squirting that we saw gives them that name.
The other day I was able to get a couple of
good video clips of them squirting. If you have not seen these things squirting, it's pretty cool and the video is only 22 seconds long. The first and third squirt come out of the lower left of the rock, in the middle of the large purple area. The second and coolest squirt comes out up and to the top right, just above the large bright gray spot.