11-30-2009, 07:43 PM
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If it's another of the same species it should be fine. Make sure the difference in size is as big as possible.
Clown fish change sex depending on their size in relation to the hierarchy. They will form a pair (or at least should do).
No matter what sex the two fish are, the larger will become female and the smaller male. The only time conflict arises is if one of the non-"breeding" males grows to within 20% of the size of the dominant male.
There may be conflict for a while (doubtful so long as you introduce a very small fish) but it should be resolved in time.