Mention black and white fish soup, Mei Xiang easily comes to mind. Mei Xiang black and white fish soup (美香黑白鱼片汤) is a popular stall during lunchtime over at Berseh Food Centre.
You can almost always see a long queue for their signature fish soup and patrons sitting at their section are all usually having their delicious fish soup.
Berseh Food Centre is a two-storey Hawker Centre located in Jalan Besar. I was there one morning for breakfast and was scouring through the Hawker Centre and found a stall named “Special Chilli Yong Tau Foo” (集兴酿豆腐). Almost everyone near the stall was eating the Yong Tau Foo even though other food stalls were opened for business. So I decided to try and see how “special” is the Special Chilli Yong Tau Foo.