Here's why:
* Ocellaris Clownfish are not different "colors": The black and orange clownfish you're referring to are actually the same species, *Amphiprion ocellaris*, but different color variations. This color difference is due to genetics, not distinct species.
* Clownfish are hermaphrodites: They start life as males and can change sex to become females if the dominant female dies.
* Breeding requires a hierarchy: The largest female will dominate the group and breed with the male. This means the offspring will inherit the genetic traits of the dominant female, usually the "orange" variant.
So, what happens when you put a black and an orange ocellaris clownfish together?
* They will likely breed: They are the same species and capable of breeding.
* The offspring will likely be orange: Unless the "black" clownfish happens to be the dominant female, the offspring will inherit the orange genes.
* The "black" clownfish may not reproduce: If the "black" clownfish is male, it will be unlikely to reproduce as long as the orange female is dominant.
To get "black" clownfish offspring:
* You would need a dominant black female to breed with a male. This is a genetic lottery as you can't guarantee a black female will be the dominant one in a mixed pair.
Remember, the black and orange variations are just different color expressions of the same species. You can't "mate" them in the traditional sense of creating new species.