This bubble coral has been sending out sweeper (stinger) tentacles to kill that leather coral ever since I rearranged this tank. I moved the leather back a bit so it couldn't reach. The bubble retracted it’s tentacle for a few days and it grew longer. Now it is touching the leather. I’m going to have to some more rearranging. The cyno is because I had a fish that wasn’t eating in an attached system, so I kept trying to feed it.