Since you're going to be in the OC try a couple of these:
Eye Candy Aquariums
8056 Lampson Ave.
Garden Grove, CA 92841
Lucky Fish & Water
9701 Bolsa Ave.
Westminster, CA 92683
Tropical Fish World & Pets
13953 Harbor Blvd.
Garden Grove, CA 92843
Tropical Fish
14241 Euclid St. #C110
Garden Grove, CA 92843
Tong's Tropical Fish
8976 Warner Ave.
Fountain Valley, CA 92708
Eastern Nishikigoi
14700 Goldenwest St.
Westminster, CA 92683
405 is cool too but I don't have their info.
ps. not all will have what you're looking for, these are just a few I've visited recently
Good luck!