They should get along. However, the long term sustainability would be the issue. It won't matter if they get along if neither of them live. I had one for about 15 months (just died) that never really ate any offered foods. It ate from the reef. It grew well, but eventually it must have eaten all of the food source, beacuse it got skinny and died after thriving for more than a year.
I would plan on them never being good eaters. Yours might eat well, and I hope that it does, but if you plan otherwise, then you will be able to care for it as long as possible.