Compatibility of RCK and Standard clown knife

[Davis811]

I wanted to know if Royal clown knives and standard clown knives could share the same habitat.

 

[benzjamin13]

It depends on the individual fish. People have had good success with keeping a pair of CKs. Most raise them together when small so they can grow up together. It's a hit or miss, but more successful if you can raise them together at a young age.