Do you want a colorfull community tank with lots of different kinds of fish, a species tank with one or two fish, perhaps a breeding pair, or anything in between.
There are definately some do's and don'ts when it comes to mixing fish:
Do's:
Fish that shoal, schooling fish, should be kept in schools. (6 or more)
These include Danios, Tetras, Barbs and Cory Cats.
Fish of similar sizes work best together.
Fish with similar land of origin and similar water conditions should be kept together.
Don'ts:
Agressive fish with dosile fish.
(unless they are to be used as feeders)
Mix water types. (freshwater, brackish and marine)
Buy fish that will grow large without planning to grow large with it.
(some fish look small when you buy them, only to grow to a size that is much to big for their original aquarium if you do not plan on increasing tank sizes for the fish, pick accordingly)
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