Adding a New Clownfish

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The easiest way to pair her up is with the smallest fish you can find. the smaller the better and easiest for her to accept it. I've done this many times to form new pairs. Use a breeder net for a couple days to introduce them to each other and you should have no problem. Ocellaris and percs are very easy to pair up. BTW your black is an ocellaris and not a percula.