I have some mini trees with 100 5v pixels on each, they are being driven by a ECG-P2 three trees on first output and three on the second, the first tree now has a pixel that the blue led doesn't work (no spares left to replace it) wanted to make this pixel a null pixel (could just wrap black tape around it so the red and green don't show), have played with the effects to make a null pixel but keep getting errors, what settings do I make in the effects to make the 20th pixel a null? On the output I have uni 1 170 pixels and uni 2 130 pixels.