In 1852 he entered the Royal Academy of Antwerp in Belgium where he studied early Dutch and Flemish art, under Gustaf Wappers. During Alma-Tadema's four years as a registered student at the Academy, he won several respectable awards. Before leaving school, towards the end of 1855, he became assistant to the painter and professor Louis (Lodewijk) Jan de Taeye, whose courses in history and historical costume he had greatly enjoyed at the Academy. Although de Taeye was not an outstanding painter, Alma-Tadema respected him and became his studio assistant, working with him for three years. De Taeye introduced him to books that influenced his desire to portray Merovingian subjects early in his career. He was encouraged to depict historical accuracy in his paintings, a trait for which the artist became known. Alma-Tadema left Taeye's studio in November 1858 returning to Leeuwarden before settling in Antwerp, where he began working with the painter Baron Jan August Hendrik Leys, whose studio was one of the most highly regarded in Belgium. Under his guidance Alma-Tadema painted his first major work: The Education of the children of Clovis (1861). This painting created a sensation among critics and artists when it was exhibited that year at the Artistic Congress in Antwerp. It is said to have laid the foundation of his fame and reputation. Alma-Tadema related that although Leys thought the completed painting better than he had expected, he was critical of the treatment of marble, which he compared to cheese. Alma-Tadema took this criticism very seriously, and it led him to improve his technique and to become the world's foremost painter of marble and variegated granite. Despite any reproaches from his master, The Education of the Children of Clovis was honorably received by critics and artists alike and was eventually purchased and subsequently given to King Leopold of Belgium.

Answer this question "What other things did he do there?" by extracting the answer from the text above.
Before leaving school, towards the end of 1855, he became assistant to the painter and professor Louis (Lodewijk) Jan de Taeye,