ktomminello: ranting aside
, you make a very good point to get more info about the fish one is interested in keeping opposed to what others would like to see in your tank. A lot comes into play when choosing, such as local availablility, water chemistry, hardiness, lifespan, and eventual adult size, for example. Being a former professional
, I'd suggest going into your local independant pet/ fish store and look at what is available then talk to the proprietors about the care and needs of the fish you are interested in. They make their living by caring for their stock so they know what is necessary (more often than not.) Pretty much every fish purchase should require 2 trips to the store. First trip is to see what's available followed by some research. The second trip would be to purchase the fish. Making sure your new tankmate will be a good fit is worth not buying it on impulse and much less costly
.
Lastly, we need to keep in mind that a lot of the fish available in today's hobby are not wild specimens or even found in the wild. For example: What is a Berry Tetra? Is it a variation of a Black Tetra? Diamond Tetra? Phantom Tetra? You see, these fish can be found in the wild, Berry Tetras cannot. The list of unatural fish goes on. More research is necessary to have a good stabile environment and a happy tank.
And to the OP, 60 liters (approx 16 US Gals.) is not a very large tank so bigger fish will probably not do well in your tank. As for breeding fish that are not Guppies or other livebearers, you might want to stay with some smaller cichlids that are known to form lasting pair bonds and like to raise their own fry. Rams, Kribensis or Convicts come to mind but are far from a complete list of fish.
I hope this helps