sentences:  A "community aquarium" refers to the mixing of fish and plants from different geographical areas with an emphasisis on the color and hardiness of the specimens.An example is the combination of gouramis, tetras, and rasboras with a selection of hardy plants such as Hygrophila difformis, Hygrophila polysperma, and Vallisneria spiralis.Choosing fish that are peaceful and compatible with each other is important in a community tank.