Can you grow flowers in the fish tank?

Fish tanks can grow flowers in water, such as water lilies.

Water lily, also known as Meridian Lotus and Oenanthe javanica, is a perennial aquatic plant of Nymphaeaceae. Water lily is a valuable aquatic flower. The appearance is similar to that of lotus, but the difference is that the leaves and flowers of lotus stand on the water, while the leaves and flowers of water lily float on the water.