Can a zebra knife go with my ghost knife?

[Pomatomus]

Two weeks ago I bought a small BGK, which is just about to finish its quarantine. He will go into a 55 gallon for growout, and then it will be sold to a customer (I maintain aquariums).

The problem is...

...The wholesaler just got zebra knife fish this week. Can the two live together in peace? I haven't kept any knife before my BGK so I decided to ask you guys. The zebra knife is so cool and pretty rare!

 

[MonsterMinis]

Knives generally do no cohabitate well with other knives. their are a few exceptions. But the general rule is No.

 

[MeiTnerium109]

The BGK will probably end up beating up the zebra--they don't like other fish that are black or knife-like.