If they are getting along well I say give it a try, you never know, just keep on eye on them.
I have a coral beauty, yellow tang, hippo tang, porcupine puffer, and a bursa trigger, everything I have read says not to do this, but seems like the temperament of my trigger and puffer are mild, but that could change with time as they get bigger, they are only 3" long now.
Anyway seems like the usual response is dont do it.
Something to keep in mind is just because it worked for me doesnt mean it will for you, all you can do is try it and keep a close eye on them, just make sure the lfs will take it back if needed.
Hope this helps!