I was mistaken. Some chalice corals look so similar to an acan echinata as shown in this article below:If you are talking about the orange one it's a chalice. Isnt a rotundiflora a plant?
I heard that having very well-established, aged live rock does make a big difference rather than going with the dead rock and starting from scratch with bacteria in a bottle. The latter method does help prevent the headaches of unwanted hitchhikers.I imagine I have some old and well established bacterial strains and sutch too idk if that has anything to do with it.