Dual Channel Arduino

Good evening,

I am a little lost in my code, I know what I want but I have trouble coding it.

Here I have two ribbons WS2812 on the same channel. I would like to add another 2 pixels on channel 2 but the worry is that the data once passed through channel 1 if I plug my additional 2 pixels, I have color problems, bad colors, blinking ..

Channel 1 (pin 2) my two ribbons
Channel 2 (pin 6) my two pixels

The whole thing must work with hyperion (the rest of the code)

Here is my code beginning:

#include "FastLED.h"

// How many leds in your strip?
#define NUM_LEDS_ALL 6

#define NUM_LEDS_CH1 4
#define CH1_DATA_PIN 2

#define NUM_LEDS_CH2 2
#define CH2_DATA_PIN 6

// For led chips like Neopixels, which have a data line, ground, and power, you just
// need to define DATA_PIN. For led chipsets that are SPI based (four wires - data, clock,
// ground, and power), like the LPD8806 define both DATA_PIN and CLOCK_PIN

#define CLOCK_PIN 13

#define COLOR_ORDER GRB

// Adalight sends a "Magic Word" (defined in /etc/boblight.conf) before sending the pixel data
uint8_t prefix[] = {'A', 'd', 'a'}, hi, lo, chk, i;

// Baudrate, higher rate allows faster refresh rate and more LEDs (defined in /etc/boblight.conf)
#define serialRate 460800

// Define the array of leds
CRGB channelOne[NUM_LEDS_CH1];
CRGB channelTwo[NUM_LEDS_CH2];

void setup() {
FastLED.addLeds<WS2812B, CH1_DATA_PIN, GRB>(channelOne, NUM_LEDS_CH1);
FastLED.addLeds<WS2812B, CH2_DATA_PIN, GRB>(channelTwo, NUM_LEDS_CH2);

// initial RGB flash
LEDS.showColor(CRGB(255, 0, 0));
delay(5000);
LEDS.showColor(CRGB(0, 255, 0));
delay(5000);
LEDS.showColor(CRGB(0, 0, 255));
delay(5000);
LEDS.showColor(CRGB(0, 0, 0));

Serial.begin(serialRate);
Serial.print("Ada\n"); // Send "Magic Word" string to host

}

void loop() {
/*
// wait for first byte of Magic Word
for(i = 0; i < sizeof prefix; ++i) {
waitLoop: while (!Serial.available()) ;;
// Check next byte in Magic Word
if(prefix == Serial.read()) continue;
// otherwise, start over
i = 0;
goto waitLoop;
}

// Hi, Lo, Checksum

while (!Serial.available()) ;;
hi=Serial.read();
while (!Serial.available()) ;;
lo=Serial.read();
while (!Serial.available()) ;;
chk=Serial.read();

// if checksum does not match go back to wait
if (chk != (hi ^ lo ^ 0x55))
{
i=0;
goto waitLoop;
}

memset(leds, 0, NUM_LEDS_ALL * sizeof(struct CRGB));
// read the transmission data and set LED values
for (uint8_t i = 0; i < NUM_LEDS_ALL; i++) {
byte r, g, b;
while(!Serial.available());
r = Serial.read();
while(!Serial.available());
g = Serial.read();
while(!Serial.available());
b = Serial.read();
leds.r = r;
leds.g = g;
leds.b = b;
}
*/
// shows new values
FastLED.show();
}

Thank you