What ever happened with these Brasiliensis? I have 3 and love them. They are very aggressive, aggressive for eartheaters anyways, and I assume thats what they were when you said a few were killed off. Hard to tell in the photos, but because of the stripe through the eye and lack of a real slope on the forehead, they were probably Brasiliensis as others said.
Let me know what they ended up being, and what you did with them?
Thanks
Art