I wouldn't add another clown. The mix of A. ocellaris and P. biaculeatus can be done, and has been (see the links below), but adding a third fish to what is likely an established pair may be pushing your luck too far. There are people on this board with multiple pairs of clownfishes in one tank but they are either in very large tanks (Steve, a pair of A. ocellaris and a pair of A. percula) or are species known to be relatively docile (Bev, a pair of A. percula or A. ocellaris, and a pair of A. sandarcinos). Similarly, keeping groups of A. percula or A. ocellaris seems to be fairly common in the hobby, but these animals would most likely be siblings, introduced to the tank at the same time.
Also, for what it's worth, the "true black percula" being sold by J&L is actually A. ocellaris. There is no pure black variant of A. percula. So I guess they should label it "true black false percula", although "black A. ocellaris" would be more accurate. 
http://www.reefcentral.com/forums/sh...hreadid=300600
http://www.reefcentral.com/forums/sh...postid=2280824
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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