Arduino Uno only lighting up 3 of 8 LEDs in WS2812 Strip
It appears that my code is to blame (scratches head). I loaded NeoPixel's strandtest and all 8 LED modules lit up on the WS2812 once that was loaded on the 'Duino.  

I will need to experiment further taking into account all of the helpful suggestions to see if I can get my code to work with only hardware modifications. 

In response to the helpful people who responded in the comments section A) Thank You!, B) I did have a filtering cap on the power rails. I didn't add it to the schematic but you can see it in my photo. You can also spot a resistor on the Data In line for the 8x WS2812. C) I will have to experiment with shorter wires and different libraries.  I plugged Vcc and GND directly from the Arduino to the horizontal row the 8xWS2812 was plugged into and that didn't change any of the behavior. I plugged the Data In line from the Arduino to the vertical rail of the breadboard and that didn't seem to help either. 

I will experiment further and report back.