This is because saltwater fish are often considered exotic and have a really great look that outshines the freshwater fish species. Such bright colors, unique markings and unusual shapes help to evoke thoughts of being on a tropical island or a sun-drenched getaway.
This situation also tends to create watery environments that are more consistent and more stable than many freshwater environs. Rapid or drastic changes in the condition of the water is more rare in oceans, so the fish accustomed to such environments are overall less tolerant to these types of changes.
This also lends to the fact that saltwater aquarium fish are harder to care for because they don't have the wide range of environmental tolerance such as most freshwater fish do.
For those who are new to saltwater aquarium fish, it is best to start out with the most hardy, saltwater species that you can find. You should also start with the largest tropical aquarium you can afford.
A larger sized aquarium means a greater volume of water, which translates into a more stable environment. Damsels are a good choice for first-time saltwater fish owners because they are hardy, affordable and easy to care for.
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