What fish would go well with guppies?

I currently have a tank with a filter and heater along with many plants and a decorative arch (and a mermaid, heh). I have three male sunset platies (to prevent mating) and plan on getting six different colored MALE guppies. What other fish would go well in this tank? I've heard that gourami bite the guppies' tales and that zebra danio get to the food too quickly for the rest of the fish.
So what would go best in my tank? I don't really want mollies or any kind of fish that needs a shoal because I can only have about thirteen fish in my tank.
Thanks!
My tank is only 12 gallons, so I don't want to overcrowd.
 
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