If you're lucky you can train marine bettas to be out during the day. I did it very successfully with mine, he's out constantly and follows me back and forth when I'm near the tank. Took a lot of patience and a dim, quiet QT for him to become comfortable with me. When he started eating from my fingers (and he still does) I knew it was going well.
Tried doing the same with a marine betta to be put in a display at work. I got him to eat from my fingers sparingly in my QT, but he was much larger to begin with so he still hides a decent amount. I can tell he's curious though and I see him multiple times a day at work.