I haven't really looked into clown pairing in a while, but I'm under the impression that percula and occelaris are pretty easy to pair up, tomatoes are iffy, and maroons are downright ornery. Assuming the designers are an occy or perc, you'll probably just have to keep them well fed and will eventually see results. I'm not sure on how long the timeframe is for sexual maturity.
You should grab a copy of "Clownfishes" by Joyce Wilkerson, which is also available electronically on Kindle for a ton of breeding info, though there have been some advances since publication.
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