Salt water aquarium fish can be tricky to care for but are a very satisfying pet once you have mastered their care. I prefer saltwater fish that have been tank bred rather than caught in the wild, for obvious reasons. You will need to check with the saltwater fish store that you purchase your fish from to find out where the fish came from. Stay away from a store that doesn't know or won't give you a straight answer.
Certain marine animals like live coral, sea urchins and non-vertebrates are also kept along with fish in the same tank but you should do your homework first about how compatible they are with each other. You would not keep sea anemones with seahorses unless you want to have dead seahorses. Some corals also sting so you need to know what species you have in your tank along with what part of the world they are native to so you don't put the wrong fish in the tank with them.
Before setting up a tank you should not mix different fish from different parts of the world. The salinity requirements are different according to which ocean they came from. They should also be compatible with each other. Passive fish can be kept together and aggressive fish kept on their own or in an extremely large tank with other fish and kept well fed so they don't eat your other fish.
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It's also important to remark that saltwater aquariums are like 3-5 times more expensive to set up and maintain. Freshwater fish are muuuch more tolerant of temperature and salinity variation as well. That being said, I like saltwater invertebrates and would keep an aquarium just of them if it was affordable.
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