I have been there several times. It is in fact a road, in Kowloon, with more than a hundred shops. tanks are crowded, fish are bagged in the morning and I don't know if all of them get "de"bagged in the evening. You see datnoids and other fantastic fish, by the ton, like we see gold fish in our lfs's..arowanas to die for, though mostly hidden in the back of the store...the guys working in the stores and/or owners very rarely speak english, don't give a rat's ass whether you do busines with them or not ( they mostly cater to the chinese ) a very unfriendly bunch, I would say, those lfs guys.
Be very carefull if you buy fish to bring back with you ( aro's is a big no no, could even get you in jail over there )..Most of them get aprehended at the airport and are left to die, in the bags, in Customs...
Having said that ,it is an unforgettable experience to stroll through that road. you can spend days over there.
As to the sw fish that are in restaurants, most of them ( except some huge groupers that are there for show and luck ) are for eating. you go in, choose, they kill it ,you eat it....I have observed truck loads of live fish arriving at a restaurant zone, near the wharf, with fish in buckets. Fish to die and kill for, if you're an aquarist..
Miguel