The first thing we need to discuss is the temperament of your fish. There are only three main different temperaments a fish can have. Here they are:
Social breeds. These breeds of fish will get along with any other type of fish. Some of the most common fish to fit in this category are Danios, Tetras, Guppies, Swordtails, Mollies and Corydoras.
Semi-social breeds. These breeds can comfortably be kept along with other fish that are of equal size without them showing signs of aggression. Think of fish like Barbs, Angelfish and Gouramis.
Aggressive breeds. These breeds of fish must always be kept by themselves, or at most, in pairs with another fish of the same breed. An example of these type of fish would be Male Bettas, Oscars and Jewelfish.
If you’ve got a good local pet store, they should be able to give you further advice on what kind of fish you can keep together. A good question to ask the pet employees is if the fish have been kept in quarantine for at least two weeks before being available for sale.
If they haven’t been quarantined the fish will be much more susceptible to disease and early death if they have been exposed to high amounts of stress (such as being on an airplane) without a few weeks rest time.
Another important thing to look for in a fish is its color. You want to choose a fish that has a dense and well-defined color. If the fish has a pattern, check to see there isn’t any signs of blurring between colors.
