From The Aquarium Wiki You can contribute to the Aquarium Wiki
by expanding this article. Dont be shy!. Difficulty is a
reference to how easy or difficult a fish is to keep. These are
fish that are very simple to look after and a perfect choice for
beginners. These are aquatic animals that are easy to keep in an
cycled aquarium tank. The animals listed here are well able to
tolerate some of the basic mistakes of a beginners tank. They
are hardy animals that can withstand a wide range of pH or a
small amount of ammonia or nitrite and can adapt to a wide range
of GH and KH. They are undemanding in their food requirements
and are therefore cheap and easy to feed. These are aquatic
animals that are moderate to keep in an cycled aquarium tank.
The animals listed here are relatively hardy, but may have some
requirements that means they either will not tolerate
flucuations in their tank environment, need careful
consideration with tankmates or need specific foods. These would
be best kept by those with some experien