IMO, the best way to pair maroons is this......if the current single GSM/WSM is larger sized, say at least 3" from snout to end of the caudal tail, I would get the smallest possible juvenile/male maroon you can find. THere are some I have seen that are about 1" or 1.5". Remember that size does not represent a clownfish's age. In other words, a 1.5" GSM/WSM can be many years old if there is a dominant female around. As long as its a male or juvenile your chances will be better. In pairing clowns that are not bought as a 'mated-pair', I always strive to get the biggest clown first, then find the other one. Or if you had a pair, and one died, i would wait awhile.
Are you around Seattle area? I have smaller gold-stripe maroons available.
- Elmo