Southern CA.
Ali at Amazing Aquariums in Garden Grove is my favorite all around store. His display tanks are incredible and his SPS are on point. There's about 50 clams in here at any point.. The guy knows his stuff
Jimmy at Reef Lounge is a crook but he has the most capital around and the most coral in a shop. He has a freaking island haha.. You can usually find very affordable coral here but crooks man...
Tongs.. We all know tongs haha. My dad and I actually run the security system for their store... He's owned an alarm business since the 80s. Tongs has it all but the live stock is cheap from the lowest wholesalers use such as Petco... Love getting my live plants here for freshwater though.
405 Tropic. If you need cheap fish these guy make deals. Also the best store to go to for any clown loach size. IT's their speciality. They buy 100s young and just grow them out and move them tank to tank.
Sandbar Petshop Has a small fish following but always has good live stock. I actually worked here. The owner is a total jerk but the quality of live in there is exceptional.. Especially for Salt.
Oceans Tropical Fish, Mission Viejo. Dave is really starting to expand. He has some sweet saltwater stuff and his store is always clean. I also get some plants from him.
Coral Collection, Lake Forest - Hey this is where I work haha... Saltwater only, set up like a wholesale. We have a 2,000gal coral pool with a 300g refugium and 300g sump. About a 900gal fish system. Matt has been in the industry for 30 years and has worked at a few wholesales and other fish store. If you're looking for SPS frags we got it
Super Nova BTS 2K - Inferno BTS $500 - Sell dozens a month haha