In colder climates or environments, it is easier to achieve and keep a tropical temperature and requires much less capability from an Aquarium heater. Acrylic-soluble cements are used to instantly fuse acrylic collectively. Acrylic permits for the formation of surprising shapes, such as the hexagonal tank. Acrylics are easier to scratch than glass, but unlike scratches in glass, scratches in acrylic can be polished out. In 1369, the Hongwu Emperor of China established a porcelain company that produced large porcelain tubs for sustaining goldfish; over time, individuals produced tubs that approached the shape of modern fish bowls. Leonhard Baldner, who wrote Vogel-, Fisch- und Tierbuch in 1666, maintained weather loaches and newts.
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