If magitek is like regular technology, water won't be the problem - salt is highly corrosive, so anything placed this close to ocean water will probably require maintenance.

[He had a Marine Biology major for a roommate freshman year. Julian may not know about magic, but he now knows more than he ever wanted to about the ocean. If he'd known he was going to end up here he might have paid more attention outside of which shiny fish were possible pets and how things got broken, but alas.]