WOOT WOOT! Humanremainz, you are right about the pulsing type behavior on the cesp.
I stared at a few of mine and some did nothing. But I have a larger colony with more polyps and I did notice the pulsing type behavior. It does't pulse like the pom pom xenia. Its much different. I saw two different types of pulse:
1. The polyps are open and then all of a sudden they close gently. Not a tight close, then immediately open up. This happened a few times.
2. This is the one I saw the most. The polpys would close really fast and tight and twist and recede. Then untwist open really quickly. I would say in one minute, one of my colonies did it like 8 times. My larger colony did the pulsing behaviors. My smaller colonies may have done it like once every few minutes but the larger colonies polyps would do it every 10 seconds or so.
Wow, learn new things all the time. If I get to borrow a camera or buy my own (been borrowing), I will try and record it and show it to others but definitely you are correct, the cesp does pulse in its own weird way unlike the pulsing like a pom pom xenia.
Good eye!