You can certainly house them together, but I would still have about 5-6 of each tetra species. How big is your tank going to be? Any ideas of what tetras you want?
If I recall correctly, tetras aren't a good fish to cycle your tank with because they don't do well with wide water parameter changes. Since you haven't set up your tank yet, I would recommend doing a fishless cycle if you are interested in that... or you can cycle with zebra danios which will look great with tetras. You would have lots of color. If you decide to do a fish cycle, I would recommend ordering some biospira if they don't have it in your LFS. I haven't been able to find it in my LFS.
I'd be glad to answer any other questions you might have about setting up a tank, cycling, or helping you select some tetras.
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Phishie

"An ounce of prevention is worth a pound of cure."

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