P. Afer are one of the most aggressive. It will probably kill your CK and possibly other tankmates on the way. Your cats will grow very quickly. Much faster than the Dats, Polys, or Knives.
300g:2 brycon 2 peacock bass an achara cat a sailfin pictus cat a juruense cat a TSN and/or one of the hybrid cats in the family of pimelodiae a black and/or silver arowana a ornate bichir a royal CK a short bodied paroon shark and possibly a red wolf fish