All boxfish have that capacity, but when I was in the business, we'd get them pretty regularly, and I never had one crash a system. I'm not saying it will never happen, though.
We did often struggle to get them to eat, and then stay full. I think they have a high metabolism, given that they're not streamlined and must exert a lot of effort to move through the water.
I wish you the best of luck with him!
I also like your wrasse, BTW. I want to put a flasher / fairy in my system. I ordered one recently, but he came in DOA.