from what i know about them, they aren't too aggressive to other maroons... and you'll probably end up with fry. just prepare for that.
i had a cichlid tank once, and everyone told me to expect fry... while i figured they were full of it... i spotted and saved fry from hiding places more times than i care to remember.
i haven't had any marine spawning coincidences yet - partly because i've never kept two of the same fish together - but when i read multiple sources tell me the same thing about a fish, i'm inclined to believe them more now.