do knife fish make good companions for arowanas? also what other possible tank mates can you suggest!? cheers!
Anything larger than its mouth and not too much agressive is fine with them. That's the same for aros and knifes. The only limitation is the tank size.
I saw a silver aro and a CK that grew together in the same tank become not so friendly with one another. The silver started to bite and hurt the knife SERIOUSLY, and kept doing it every time the CK came back to the tank. It got REALLY hurt sometimes.