Welcome to Reef2Reef!!! You may try raising the water level and see if that affects the bubbles. Additionally, you may find this R2R article helpful with getting started:
The Supreme Guide To Setting Up A Saltwater Reef Aquarium This article was sponsored by @MarineDepot at www.marinedepot.com. Introduction The marine environment is one of the most complex systems on the planet. The aquarium you are about to set up is only a tiny sliver of the vast ocean...
Is that a protein skimmer that I see sticking up in the back? (Taller rectangle box on the left?) That could be the source. Otherwise, it is probably just the turbulence of the water hitting like a waterfall. Adding rock to break the flow and raising the water level - which would happen if you add rock - should help to resolve the issue.
Welcome to the fishy family!!