My experience with Hong Kong folks is that a lot of them do keep fishes, fresh water or marine, almost every home has a fish tank despite their small apartment unit. Another reason I was told (I did not verify this) is that the Hong Kong apartment units are designed with 2 sets of water pipes: fresh water for consumption, and salt water for sewage purposes. So it's like they can have a tap for nsw in their house, which makes keeping marine easy. They seems to like big fishes, and the big angels are one of their favorites.
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