it is a little bit darker in the back, has a black spot in the middle of its body, and on back by its tail. and it has light black vertical stripes on the back of its body, you can hardly see them
Not sure about texas, but my jack dempsey just reached 8" after 2 years. Very slooooow growing. Who knows maybe he will reach 9".
I would guess texas would be similar. Maybe 10" or 12" after 2 years.