11-10-2010, 07:23 PM
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First off, welcome to Tropical Fish Keeping forum.
Now, to be honest, none of those fish are suitable for a 5g tank; they are all livebearers. If you could manage a 10g, a trio of any one of them, males only, would work, with perhaps a substrate fish like a trio of Corydoras or the shrimp. Assuming you are set on livebearers. I mention males only because with a female included, even if only females, you will have hundreds of fry to deal with; female livebearers can produce many batches of fry once impregnated by a male, and this is very likely to have happened in the store tank. So many fry will quickly pollute a small tank.
Another option for either the 5g (if that is all you can manage) or a 10g are much smaller fish. You can have more fish and it will be more interesting. Depending upon your water parameters, there are soft acidic water fish and some basic harder water fish in this category of small. If you can tell us your water paramweters, meaning hardness and pH of your tap water, we can suggest some suitable fish.
But I really would not recommend livebearers in a 5g. And live plants would be a benefit especially in a small tank.