I agree,
Check for compatibility WITH your gouramis and WITHIN your tank size. Do not get a fish just because it looks cool or on a whim, research what you want and figure out how it will do in your tank. None of us is trying to take the "fun" out of it, but the fish you are suggesting are just not possible in your tank. You will probably end up like the rest of us, with multiple tank syndrome..heehee. I started out with one tank, now I have 4 and im getting at least 2-3 more FW tank, then next year im doing a SW tank. Its a learning process, but dont get any fish intending to just "let them duke it out." Good luck.
Sandy