[Chiefsurfer]

I would LOVE, LOVE, LOVE to have a marine Betta. I would tend to think that it would be ok. I know very little actually about them, but have found LiveAquaria pretty spot-on about their tank requirements. It is quite possible that they are very slow, methodical swimmers, kinda like a pajama cardinal. If you watch them, they do not generally move too much, when they do, it is usually very slow and precise. Those types of fish tend to require less room because of their lesser requirement for swimming room. Maybe someone more familiar with the fish can give advice. The only measurement I am a LITTLE worried about is the fact that a 55 is only 12-3/4 wide.