Their no real rule on putting together clown fish. Lot depends on size of the tank. How long a pair been in there . Size of clowns and spices. Also the temperament of the fish. I just added two onyx clowns to very big female Spotcinctus and male Clarke in 55 and they getting alone great. My advice watch when you add them and see if they territorial and see how they react and going along. I did have a few not get along as well.
Plenty of places to hide. Good luck
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