Everything I've heard for years tells me that they are all born "genderless" then the largest one develops into a female and the second biggest turns into a male. If the female dies, the male turns into a female and the next largest one develops into a male. If the male dies, the next largest develops into a male and the female stays the same. I've had this happen in my tanks before so I have personally witnessed these types of gender transformations.
Right now, in the cube tank, the two largest have bred and adopted the RBTA (although they have a third roommate). The other four or five small Ocellaris stay away from the mated pair and live on the other end of the cube tank.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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