turning off a single LED using Rainbowduino 3.0

I just started playing with my Rainbowduino v3.0 and a 8x8 LED matrix

I can turn on LEDs, draw lines and shapes, etc. I can clear the entire matrix - Rb.blankDisplay(). But, I can’t figure out how to turn off a single LED. I want to turn on a LED at position 0,0, turn on a LED at position 0,1, and then turn off the LED at 0,0 (while still leaving the LED at 0,1 turned on). I don’t want to clear the entire display but rather just the single LED.

How do I turn off a specific LED?

I figured it out. I just need to use RGB values of 0,0,0.
Rb.setPixelXY(x, y, 0, 0, 0);

I tried this with the 24-bit color code and I got a compilation error if I recall correctly. Maybe I was doing something else wrong. Here is what I tried: Rb.setPixelXY(x, y, 0x000000);