Once you have become an aquarium owner, there are hundreds of different options for cool pet fish that you can add to your tank. However, before simply deciding on a fish because of its appearance, it’s important to make sure that the fish’s behavior and environment needs are within the abilities of your aquarium. For example, if you have a freshwater tank, do not try to add a fish that lives in a saltwater environment! As long as you keep the needs of your fish in mind, you will have the potential to add many different species of cool fish in your aquarium. Here are some really cool types of fish that are popular among many aquarium owners.
DWARF PUFFER FISH
The Dwarf Puffer Fish is a species of fish that thrives in freshwater environments. Many people associate puffer fish with saltwater environments, but this is not the case with the Dwarf Puffer. It’s important to remember that Dwarf Puffer Fish can be a bit aggressive, so choose the other fish in your aquarium carefully. Most Dwarf Puffer Fish will do well when given at least 5 gallons of “space” designated for their territory.
KOI FISH
Koi fish are most commonly associated with Asian culture, mostly due to the origin of the Koi in Central Europe and Asia. They are featured as design elements in many paintings, fish pendants and even stone sculptures. As a pet fish, the Koi is fairly low-maintenance. There are many different color variations for Koi fish, which make them a really cool fish to have in an aquarium. However, it’s important to remember that some Koi can grow to be fairly large, and may require a fairly large fish tank.
PARROTFISH
If you have a fairly large saltwater tank, you may want to look in to purchasing a Parrotfish for your tank. Parrotfish can grow to be fairly large, some breeds even reaching up to 4.5 feet in length! For the majority of captive Parrotfish, 2 feet is the average maximum size for most breeds. Caring for Parrotfish can be a full-time job, especially since Parrotfish cannot be kept in a reef tank. Parrotfish have a habit of destroying coral, which can be especially destructive in a closed aquarium environment.
MARINE ANGELFISH
Not to be confused with freshwater angelfish, Marine Angelfish thrive in saltwater environments. Most Marine Angelfish are characterized with bright colors and striking patterns. Marine Angelfish tend to be territorial, so should not be kept in groups in any aquarium.

Tue, Jan 5, 2010