Pictures of other species here
A male metalic livebearer.
Female metalic livebearers are considerably bigger than males.
Fishkeeping Facts and Tips
Should I have water movement in my tank? Fish from faster flowing rivers love swimming against a current - fish from vegetation choked marshes do not. With todays box filters it is quite easy to get some good water flow for strong swimmers like Rainbowfish, whilst a spray bar attachment can completely remove this for gentler swimmers like Gouramis
Have a look at some of these related sites