If you have just decided to set up an aquarium, the number one question on your mind must be what kind of fish should I get? When you look at your choices in the pet store, you realize that it will not be easy to make that decision.

If you are new to fish keeping, this can be an overwhelming task. But before you choose what particular fish you like, consider these three important questions. One, exactly how big can this fish get? Two, what quality of water does the fish require? And three, will the fish peacefully coexist with the others I want?

Some fish will stay small, say an inch or less. These are generally considered community fish. Many fishkeepers select a group of similar community fish to fill their tank. Good choices for tropical community fish include guppies, swordtails, Platies, and dwarf Gourami. When selecting these varieties, choose fish that are about the same size, and avoid mixing different varieties unless you have been advised that they will get along well together. Never purchase just one community fish; they are used to swimming in schools, and will get lonely in your aquarium. A good rule of thumb for this size of fish is one inch of fish for one gallon of aquarium water.

Other bigger species of fish can grow from 6 inches to several feet in length. They are generally best kept alone for they are known to attack or eat smaller or weaker fish. You will need a larger aquarium to keep them in. A ten gallon tank may suffice while they are still young, but eventually, you will need to transfer them to something bigger.

When buying your fish, it is best to immediately get the aquarium that would accommodate the adult size. Once you have chosen the specific species that you like, find out how big the fish are at adult size and get the correct size aquarium. The one gallon per inch rule of thumb for the much smaller community fish would not apply to these kinds of fish.

There are some types of fish that can thrive in almost any type or condition of water. The goldfish is the most popular of these varieties. They are recognized as almost invincible. They will no doubt continue to survive even with no aquarium lights or filters, but this is not exactly wise fishkeeping practice.

The slightly more picky tropical fish need a narrower water temperature range, as well as high-quality water. To achieve the water quality these fish need, test your water frequently, use a good filter on the aquarium, and consider products like the EcoBio-Block, which improves your aquarium water quality and reduces maintenance. Some fish need a specific pH, or have other water quality requirements. Be sure to do your research so that the fish you choose have similar water requirements.

Marine or saltwater variety is the last group of fish. Keeping them, however, is recommended only when you have enough fish keeping experience with freshwater fish. Though these fish are attractive, they do require a lot of maintenance work in order to keep them healthy. Other than keeping watch over the water quality, lighting and temperature, you also have to keep track of the salt level in your aquarium. Note also that you cannot mix freshwater fish with the marine varieties in just one aquarium.

And lastly, examine every fish closely before you buy them. Check that they have healthy bright eyes, intact tails and fins, no missing scales or injury of any kind. Observe if they have healthy appetites and a high level of activity. Choose only bright and healthy looking fish.

As you can see, choosing your fish is an important factor when creating your aquarium and good choices will mean many years of enjoyment to come.

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Article Submitted By: Leonard Boyler
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