Need ID

I have a few in my tank. They're either sponges or tunicates and are completely harmless either way. If anything, they're beneficial and add diversity.

2nd Sponges. They may spread but usually stay to the shadows. I have 4 color forms of sponges that have all come as hitch hikers: orange, purple/black, pink and a yellow that fluoresces in the actinics. They are harmless. The tell tail that it’s a sponge is if there is a hole on the top of each of the high points.