I haven't had a mix of fish with the tetras before, other than the otos/corys. Had 12 tetras at one time and they just played tag. Nothing harmful.
I want to give the tigers a try all by themselves. If I can't rehome the tetras then I'm still at a loss for whether to try and make two teams of fish, tetras and tigers or to let the tetras fend for themselves.
Thanks for the reply, K