hi.
Last time when I visited the "Black Coral," I was not particularly impressed. I usually go to Jeff's Exotic Fish for corals even though I need to drive 10X as far. Personally, I feel it is worth the drive. Is Black Coral still in business?!?
Fish 2000 is OK, and sometime they do have excellent price on livestocks and hardwares. Other places to visit are Tong's in Fountain Valley, another right by the beach in Hunting Beach (don't remember the name, but take a look at the Yellow Pages if you want....).
There is a local reef society that you can contact (SCMAS), and they maybe able to arrange some private visit. There is also a private institute in Southern OC (~25 minutes from NB), but I don't know if I should mention the name because they are still setting up, and most of the exhibits are local (cold water).