I'm kind of interested in this topic, from the point of view of "what does peaceful/aggressive really mean?"
I understand some corals extend sweeper tentacles
Some corals have toxins released in the water
Some corals can eat fish (anemones)
I am also aiming for an LPS dominant tank, but I have barely a clue about coral aggression and I feel like I'm going to be losing corals to "warfare" by being unaware of the placement issues...
I know people say, "Do your research before you buy a coral" but there's only so much you can find on youtube/message boards before it becomes redundant and only experience really helps...
FTR I have Favia, an oxypora, a candy cane (caulastrea) and in my QT I have a plate coral, and a mycedium... but I have never seen the mycedium extend any tentacles or anything.