I am new to corals myself. I have some zoas that I bought recently. I was told to leave 2-3 inches between the different kinds. I did just that and they are doing great. I bought a big frag pack with like ten different kinds. I spread them out all across my tank. I also have a Colt coral that I added after the zoas. I just left 2-3 inches between it and the nearest zoas. So far, so good. I plan to get some shrooms and maybe some ricordia next. I only have PC lighting so I can't do any SPS corals. Good luck with the zoas, these are my first corals too.