adding clownfish

I recently added a small occ to my 20g tank. My good friend has another that he says he is going to give to me. Before he got it, his fish was a 3rd clownfish in a tank with another pair but it has been alone in his tank for awhile now. His fish is much bigger than the one I have. How soon do I need to add my friend's fish to my tank? He said he might not get it to me for a few weeks.
Mine is obviously not female yet. Would his be male or female?
Thanks guys
 
regardless of gender, they should be fine. Yours won't turn female in a matter of weeks. As always, when you introduce the new one, observe. Observing is the fun part anyway!
 
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