Heres a pic of the 5 in my tank, have been in the tank for over a year, no problems, and no aggression whatsoever. Peaceful and timid, also great fish.
i have a scribbled rabbitfish, same family as the foxface, have never had any problems with it, swims around with my tangs, hes never come close enough to me to spike me with his spine's, so i dont think you need to worry.
Well water changes are rather fun, i couldnt tell you how many instant ocean buckets ive been through. Usually 90 gallons a month. And the one bad thing about the size is evaporation. it seems like my smaller tanks never lost water, but this one is a different story.