LFS I frequent:
Tropical Fish House: 5146 Holt Blvd. Montclair
(909) 624-6417 Often has obscure fish, decent price, family owned, plant selection minimal
Goldfish Plus: 1027 N. Grand Ave. Covina, 91723
(626) 966-2308 Has a ton of stuff, but the owner will try and sell you the store if he could, plant selection minimal
Hacienda Aquatics: 1075 N Hacienda Blvd. La Puente, 91744
(626) 330-4716 Often has rare fish, plant selection minimal
There are a couple more but I cannot find the addresses right now.