My GR GR grandfather was Henry John Godfrey Bower SNR half brother to Gottlieb Gottfried Bauer (known as Godfrey Bower) arrived in Tasmania in June 1855 with his father, step mother, step sister and 6 of his surviving siblings. His youngest sister was left behind in Germany. His fathers name was Johan Gottried Bauer and his step mother was Caroline Rosina Klinger they married in 1855 and travel to Tasmania the same year. They had a few more children born in Tasmania this is where my Gr Gr parents come into things.
I think Gottlieb and your Johannes are brothers. But I have further information about the ship and dates etc. Please give me an email would love to exchange info. Sharlene