Guppies are my favorite fishes, and I have five or six guppies in my tank. Moreover, from my experience, I can say that guppies get along with great with many other fishes. For example, I have neons, tetras, and barbus. They all live together, and I haven't noticed anything wrong yet. Also, I can recommend you to check this post on thepets.net, there you will find more detailed info about guppy tank mates, and I hope that info will help you.