it's a 180g tank. I have in it:
2 big altifrons, plus 4 juvies which I am trying to sell (see Li's post above yours)
1 Jurupari
2 Daemon (pair, probably)
5 Meridionalis
1 Gymno fish, female, have no clue, first photo, below the big geo
Plus about 2 dozen Columbian tetras, 2 dozen misc. Corydoras catfish, 6 Dinema catfish (urostriatum and longibarbis), and a couple of Flying foxes.
No aggression, everything is perfectly fine. Juvie Altifrons "firemouth" with each other once in a while, but no real aggression.