13 gallon fish stocking?

I have a 13 gallon tall tank, it is well planted with gravel. I have two guppies and 3 apple snails and would like to add some more fish. I have read that a dwarf gourami and some tetras would do well in a 13 gallon, but what about with my guppies? I need some good tank mates. And please don't tell me about he baby issues with guppies. I can handle that accordingly. Thanks for any suggestions!