One of the easiest aquarium setups there is that can be great to learn all the intricacies associated with being an aquarium owner is to set up a guppies aquarium. These interesting little fish are by far found in many aquariums around the world because they are so hardy, and breed prolifically. Each male fish is as individually color marked as a fingerprint is different. Look as hard as you want and you will see there are no two the same.
Besides its beauty the guppy has other great attributes. Hardly any other tropical fish species combines so many great points in such degree. It is a live bearer, extremely fertile and dependable breeder. It is a very active fish keeping the gaze of many a viewer transfixed on the guppies aquarium. It thrives in close confinement, can stand fairly foul water, and handles a larger range of temperature than other tropical fish. It pretty much eats any kind of food, does not fight, is not timid, and matures rapidly. It is subject to very few diseases, making it great for a novice to learn aquarium principles. Add to the fact that you can pick these fish up for a very reasonable price anyone can afford, even kids, makes it the ideal choice for a beginning aquarist.
The female of this fish species is larger than the male as usual with a live bearer, and if pregnant will show a darkened area near the anal fin (circled below in red). The bulging line of the belly indicates that delivery is near, especially when the sharp fullness extends to the forward part of the body just behind the head of the fish. 
The tail fins of Guppies often appear to be oddly shaped or sometimes partially clipped. This is usually due to the opaque color markings being placed on fins, which are so transparent that it is almost impossible to see them. When selecting a guppy or two when starting an aquarium, don’t worry about the tail, it is probably all there you just can’t see it.
A great starter tank would be a 10 gallon aquarium filled with a mating pair of guppies. In a while the aquarium will be teaming with more of them especially if you choose a pregnant guppy right from the aquarium store.
