In my experience - bad idea. I had 1 each of colombian tetra, black widow tetra, & neon tetra along with a krib, 2 guppies, angelfish & scissortail rasbora. Admittedly a very bad combo, but even with all those aggressive fish the 3 tetras all avoided each other as much as possible even when the krib was doing the psycho thing. Maybe this was because there were only 3 tetras, or maybe because they were very different sizes, but unless u know u'll be able to return them if it doesn't work out then I'd say just go with a group of the same tetras. Just my opinion.