Rams do "browse" meaning they sift sand and gravel in their mouths, then spit it out, while looking for food. Thus the "mikrogeophagus" or small earth eater. They also dig holes to deposit eggs into. They do this by pushing the grave or sand aside with their noses, although these tend to resemble wide, shallow depressions. Sound like any of these?
But yes, 10 gallons is too small for even a single ram.