That is just the color of your fishes scales,it does not really mean anything, why do some people have blue eyes and some people have brown eyes its just a distiction of that fish.
The word tropical simply means that something is from the tropics; ie, near the equator. There are two kinds of tropical fish; tropical freshwater and tropical marine. When someone says 'tropical fish' in a pet store, or in the context of an aquarium, they generally mean tropical freshwater. Marine fish are simply fish that come from the ocean, ie, they are saltwater fish.
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