I have this blue stuff that is kinda clear but a very bright blue on parts of my live rock. I’ve seen it in 3 places. Doesn’t look like a sponge to me and doesn’t seem like a tunicate either as it’s not growing and as far as I can tell it’s not pushing water out. rock is from a tank that is about 15 years old as well as a few pieces of rubble from the ocean. The spot photographed is 3/4” long
![IMG_8715.jpeg IMG_8715.jpeg](https://www.reef2reef.com/data/attachments/3589/3589238-2b112b01e07992c9e5c8ed7696f44f44.jpg)
![IMG_8716.jpeg IMG_8716.jpeg](https://www.reef2reef.com/data/attachments/3589/3589237-c3dcd7f2ca9e2162a81193e0a0c08da9.jpg)
![IMG_8715.jpeg IMG_8715.jpeg](https://www.reef2reef.com/data/attachments/3589/3589238-2b112b01e07992c9e5c8ed7696f44f44.jpg)