Where do you live? It's also about convenience since you are starting a hobby and having to transport the heavier items such as tank, filter and lights etc. Also, aquariums offer a mix bag of high-end and low-end stuff. If you are looking for a short answer, then Nanyang Trading Aquarium, PolyArt (within famous Block 328 Clementi Ave 2 cluster), That Aquarium, 181 Aquarium, Toh Aquarium.
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