Two 2.5' jau catfish rule the tank. There are also 10 RTC 2'-3'+, two TSNxRTC hybrids, one TSNxLei hybrid, two TSN, 7 pacu, one leerii, one Distichodus sexfasciatum, 4' arapaima, and barramundi perch.That's one thing with monster fish, adding anything new is always risky, and the risk factor increases as the tank gets older.
What all you got in that tank and who is the big boss of the tank