I don't know if Ron still has the breeding pair, I believe so, mrmann may know for sure.
I have the 10 (think there are still 10) with about 30 Gymnogeophagus Yerbailto, in a 50 gal, with tons of current.
I've had T. tuba in the past and found them to be absolutely lethal with each other, unless there are lots of other distractions from other species, and current to fight.
They are still too small, and never stop moving long enough for me to get a good look, or a clear shot. One of the reasons I take so many photos is to get a close up look at what is going on with my fish, they will need to put on more growth to be sure.