Operating under his business name, Sun Mow Loong, he eventually established a successful general trade store and real estate enterprise.
In 1884, Kwong Sue Duk married his second of four wives, Chun Ngor Gwei, and obtained his naturalisation certificate in Australia.
In 1885, Kwong Sue Duk moved to Palmerston (early Darwin) and in March 1887 he met and married his third of four wives, Yuen Yuk Lau.
His first wife had difficulty adjusting to the harsh conditions, and in 1898 he travelled with her to China where she chose to remain with her four children.
However, the damage of the cyclone and the generally depressed state of the Northern Territory economy left Kwong in a poor financial situation.
He continued his herbal medicine practice in Melbourne and country Victoria, including the townships of Ballarat and Bendigo.