For knowledge of fish and plants, forums like this and google are your best bet. LFS workers does not know much at all.
As far as seeing many different variety of fish, I would try Tong's in Fountain Valley.
Eye Candy is in Garden Grove and I don't think they know much about plants or freshwater stuff. They are more into salts.
A+ caters to nano fish and has some selection of plants. They will bring in those uncommon fish. They are a sponsor on SCAPE. They would post what's new or members would update what they have in stock when they stopped by.
Nature aquarium in Santa Monica is a good place to go. They have ADA tanks and display
Last edited by ShortFin; 10-12-2011 at 04:34 PM.
Reason: added Nature Aquarium