One thing worth mentioning about brain corals is they do have sweeper tentacles, so give them some room. They tend to be slow growers so a small frag would probably work in a corner of a 10 gallon for awhile.Favias and LPS in general are easy as well but if you’re looking for the easiest corals to get started, I’ve found mushrooms, zoas, toadstools, xenia, Kenya tree, GSP, etc to be the easiest. With all these softies, I would resist all temptations and put them on their own rock/island. They spread like wildfires and very hard to control!