Is live rock necessary for what, what are you referring to? By having only live rock it's almost like a fish only tank, Perhaps not other but to me it is. Depending on the fish, some fish thrive off live rocks. You have to check with your local pet store or where ever you are going to get your clowns because you don't have to have an anenomae to own percula clowns, however, to many others, they say you do. This is not true, many percula clowns are tank raised so they have never been physically introduced to an anenomae, the argument here is that some may say it is nature to the clowns to have an anenomae present in the tank to successfully have them. I find that not to be true, I've had a percula and clark clown without an anenomae for quite a while and they are great. But don't get me wrong, each fish is different, I am telling you by experience, I have friends who has anenomae for the fish as well.
