Yeah the suction should be fine. Make sure he doesn't see the am era, or else you'll be looking at a broken lens lol. Seriously though, I've seen videos of them breaking peoples thumbs and cracking glass aquariums.
My tanks (so far
5.5 gallon Planted Dwarf Puffer tank (2 Dwarf Puffers and a lot of RCS!)
16 Gallon Planted
(GBR pair, 3 amano shrimp and a whole bunch of snails!)