Tonyscoots84 said:it all depends on luck and space. the more space the happier the tangs will be.
I don't think keeping fish alive involves luck.. You have to have the right environment, right support equipment, knowledge in the fish's needs, pick the right fish, willing to spend time in obtaining all of the above and have patient while doing and learning it all.
You can have a 400 gallon tank and a bunch dead tangs if you don't know what you are doing.