Hi 3dresearch,
In some cases using hardware anti-aliasing can cause issues, so the first thing I would do is go to Unity's 'quality settings' and make sure anti-aliasing is set to off. If you still have this problem, can you tell me what version of Suimono you have (the latest is 2.1.2) and what version of Unity you have?
Reflections while underwater should be upside down, but the underwater fog effect should render properly in deferred and forward. There might be a specific setup issue or bug here.