Fish for Your Aquarium

While it seems that there are an unlimited supply of fish species in any pet store, the fact is that the usual dealer's stock includes only about 100 species. While technique, water chemistry, and nutritional knowledge are important, the fish are the main reason to have an aquarium. So let's talk fish !
While many pet stores are willing to fill special orders for fish (as long as they are on the importer's lists) rare species of fish can be gotten in hobby magazines or in the publications of speciality fish breeders.
We should never accept fish that are ill or show obvious signs of damaged fins, etc. It is strongly advised that new fish should never be directly entered into a community tank, but put into quarantine for a week or so to be sure that they are not carrying a disease that could become an epidemic and destroy our established aquarium inhabitants. If they do become ill, it is easier to treat one fish than an entire community. Do not put the fish directly into the aquarium from the plastic bag they arrive in, but float the plastic bag in the aquarium until the water temperatures are equaled; this should take about 15 minutes. Even then, do not simply dump the new fish into the aquarium, but gtradually fill the plastic bag with the water from the aquarium so the fish become accustomed to the new water, then release them. Some fish will panic during this process and should be released as quickly as possible to avoid hurting themselves. Even though a new fish may be bigger, it is common to be harassed by the previous occupants. Given time they will find their social position in the tank. It requires a little time for them to become established and adapt to the new surroundings and water conditions.
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