In general, what should someone keep an eye out when buying colonies? What do you look for besides good polyp extension and making sure the corals aren't covered in pests. As of now, I have several zoa frags and few LPS like Acans and euphyllia, all of these are very small and to be honest it is quite rewarding to see new polyps grow from these frags. What are the pros and cons of buying a colony vs growing one from frags? besides, the obvious money point of view. There is an LFS I visit often, all my frags are from them, and I have been happy so far. Just wanted to know if there is any advantage at all for buying decent size colonies over frags, besides the immediate reward of a great looking tank?