I beg to differ..
my neon and glo-light tetras have never seemed to be aware, or care, that they are different species..
I once had 6 neons and 4 glo-lights..(about 6 years ago)
over time a few have died..
im now down to 4 neons and 2 glo-lights..
they have been one happy school of 6 fish for many years..
I do agree that danios will not school with tetras..
but in my experience, different types of tetras will school together.