Damsels are very hardy, and often used by misinformed Easys to cycle their new aquarium. While the fish may survive, they now rule the whole aquarium (Easy aquariums are also relatively small in size, exacerbating the issue) as their territory and any fish added after are attacked relentlessly. Large tank size plays a huge part in keeping damsels with other fish and conspecific individuals. It is important to keep in mind that the seemingly small-sized minimum tank size requirement for damsels assumes that only one fish is kept. In the wild, some damsels can lay claim to an area the size of a midsized aquarium, driving off any fish that come near. Some damsels exhibit bright color patterns only as juveniles, and morph into something plain and unattractive. On the other hand, there are some species that are vivid in color through out their whole life, and relatively more placid.