zenia

I bought a pulsing zenia a few months ago. A strange pink with tiny purple bumps "bubble" is growing next to it and growing quickly. Any idea what it is? <!-- / message --><!-- attachments -->

I just got a peice of pumping zenia. When i got it home it was off the rock it was on. Can i just rubber band it on to another? Will a pepperment shrimp eat my zenia?