I have successfully kept a Black Xingu Wolf/Hoplias Curupira with Gars, SA/CA Cichlids an Armatus and a Scherzeri for 2 years without incident. I will say however that each individual is different and you may not have the same kind of success. If you do attempt a cohab make sure you've got a spare tank just in case and try the cohab in as large a tank as possible. Also make sure that the tankmates are larger than the Wolf and introduced prior to the Wolf itself and your chances at success will greatly increase. I will warn you in advance Curupira are very active for a Wolf and are not prone to staying at the bottom. As a matter of fact my Curupira stays close to the surface of the water approx. 40% of the time he's currently 14 inches. So be wary of the thinking that a surface fish will be safe from the Wolf's prowling.