Weird... maybe the mirror doesn't need to move, some sort of new fangled technology haha.
There is no mirror. It's an electronic VF according to Canon's website.
If your tank lights lean green then use the fluorescent wb. Works most of the time since fluorescent lights generally leave a green cast.
OK a couple of tips for the beginner.
1st Set your metering to Center Spot if your camera allows it. Most are set to averaging or center weighted.
2nd Set your focus point if your using auto focus to Center if your camera allows it.