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I put a perc from my office tank into our 180g tank that has a pair of maroons in it. They immediately kicked the stuffing out of it so badly that it actually swam into my hand so I could pull it out. It's now in another tank doing well. So my experience is "no" you can't.
Pairing maroons is a little trickier than with other clowns. Other clowns, you just get two and they can grow up and have their dominance issue etc. but one will eventually submit. Maroons don't give up fighting, so this strategy usually ends up with one dead maroon. The usual method is to wait till existing one has reached sexual maturity (usually about 3" or in case of GSM, when the yellow stripe has come in). Introduce, a small clown (1" or so). Some use a breeder's net, others just let them loose. If the existing one doesn't beat the crap out of it within 15 mins or so, you probably got a pair. A little sparring is ok but watch for the submissive dive from the smallish one.
ricwilli,
send PM if you are serious about selling and have a GSM.