04-01-2012, 06:29 PM
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We're dealing with a fairly small space. Three male guppies (no females) are OK [adding a female means fry regularly], or perhaps Endlers Livebearer which is quite a beautiful guppy-related livebearer. There are also several other "dwarf" species that suit such tanks, especially when planted. Ember Tetra, Dwarf Rasbora, Emerald Dwarf Rasbora, Scarlet Badis, Sparkling gourami, Mosquito Rasbora, to name a few that come to mind.
Your water is soft with low KH so this is quite suitable to most of what I've mentioned. The pH will likely lower as the tank matures biologically, and for some of these fish this could be helped along initially by using some rainwater mixed with the tap water.
Check the profiles, the names have shaded meaning there is a profile for that species.