If you are standing still and then you start moving forward, the endolymph in your inner ear will you are standing still and then you start moving forward, the endolymph in your inner ear will

The answer to this question would be: move forward 
Endolymph is the organ in the semicircular canal that can detect acceleration and deceleration. When your body moving forward, the endolymph is lagged behind, and then slowly moving forward. When you stop the endolymph still moves and then slowly moving backward. 
it similar to the case when you stand inside a bus that moving or stopping.

The best way to tell its true color is to look at the minerals streak