As far as tanks go, consult guys who have experience with marine systems- especially since saltwater is much more corrosive and denser so things like a suitable tank stand and glass thickness are even more important. Overall I’d say Iwarna is the most reliable lfs that specialises mostly in saltwater livestock and upkeep. They also sell secondhand refurbished tanks there and lots of scape options, though they don’t usually have much stock of equipment. Ah beng aquarium and coral farm have the widest variety and volume of fish at very affordable prices, but that also comes with its own drawbacks- higher chance of parasites and fish potentially caught by cyanide. For equipment you should try places like Aquamarin Aquatic Pets, Deaquatic and FreshNMarine. SAS is TOP quality but it’s the most premium and therefore the most expensive. Be prepared to fork out $$ for stuff that may be much cheaper in the modest stores. If you’re into very premium corals, Reefing reality is the place to go, though I would recommend against it if you’re a beginner. Pinnacle Aquatics and MAdpetz are small but great if you’re looking for basic reefing necessities.
All things considered, remember to take it slow and enjoy the hobby while you’re exploring new ways to improve.
All the best! Hope this helps
Cheers
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