I had tuba about 8 or more years ago. Started with 7 juvies in a 150 gal with a 1200gph pump.
In hindsight I should have doubled the pumpage, as they are rapids dwellers, and believe this will temper aggression.
I saw them in Costa Rica in very fast flowing shallow water, with rocks breaking the surface, they would dive under the rocks and disappear with approach.
Ended up with 3 males, that I gave to a friend who had a large female, she killed 2 males and mated a few times with the remaining male before killing him, and I ended up with a few fry that killed each other. They are good in a community with small noncichlids, but seem to reguard other cichlids as threats and treat them as such, and are quite capable of fast, lethal, retribution .
Like aclockwork I now have seiboldi, juvies so far
and some Tomocichla asfraci fry.
I have a 2400gph pump running the asfraci tank, and do daily water changes. With this regime, so far, so good.