black ocellaris - do they have to be in pairs?

No. You can pair them up with a regular Occelleris Clownfish. My plan was to have a B&W Occelleris clown and a regular Occelleris clown as a pair for my future tank.
 
If im not mistaken I think the OP was asking if they can be kept singly or best in pairs. Clowns can be kept singly but imo they are more interesting in pairs.
 
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