There are actually like 10 LFS on Tustin Ave right near Ocean Blue. Be careful buying livestock at Ocean Blue. I live right near there so its kind of my home LFS. Only place around that has excel. You may get a good deal on a tank there(got my Osaka from Ocean Blue), but the livestock is terrible, especially the freshwater stuff. Tons of dead stuff in his tanks, algae everywhere, and very dirty, poorly organized store. I guess they are moving soon too. Hopefully they do a better job at the new spot.
The Reef in Anaheim is a bit of a drive, but an Awesome shop. Its on State College/Lincoln below the 91. GREAT livestock (including cherry, amano, tiger and CRS), decent live plants (beware snails) and just about any accessory you could ever need.