Acestrorhynchus falcatus...most likely. An aggressive predator who attacks swift, silent, and deadly. Will accept most meaty foods and will attain a length of around 12". They are better in shoals. Their eating habits are very similar to those of the African Tiger Fish (Hydrocynus vittatus).
I haven't talked to him in awhile and did not ask him what size the were.
He has some big tanks if there still alive they have to be pretty big by now.
He also said that the cudas were very fast and looked hard to catch.
I have to ask him hows it going with the mixture. I'll get back with this later this week.