Dang, this is a long thread.
I have to say, those original tinfoil barbs you had were probably the best looking TFB's I've seen. I have two myself that are well over 12 inches, but they are no where near the brilliant colors that yours were. I also have two red hooks that are around 7 - 7.5 inches long, but again, not as colorful as yours.
So, just a quick question for you. The red tail tinfoils are a different species correct? And they also reach 12 inches in length? How long did you have those guys?
And the filament barbs, they really get to 6 inches long?
Forgive my many questions, but I am a moderator on an oscar forum, and recommending tankmates can be difficult for oscars. Outside of silver dollars, not much grows large enough to live with an oscar without being considered food, but stays small enough to keep in an average (55-75g) sized aquarium.