fastled - striped twinkle

stripedTwinkle.ino

void stripedTwinkle(){
int twinkle = 0; 
int flash = 15; // twinkle flash time
int lag = 50; // time between twinkles

for (i  = 0; i <LED_NUM i++)  
{
if (i % 2 == 0)
{              
  leds[twinkle] = CRGB::Red;
}else{
  leds[twinkle] = CRGB::Green;
}
  FastLED.show();
}

// add twinkles

for (int i=0; i <= 150; i++){
twinkle = random(NUM_LEDS);
leds[twinkle] = CRGB::White;
FastLED.show();                                                            
FastLED.delay(flash); 
if (twinkle % 2 == 0)
{
//RESTORE PIXEL
  leds[twinkle] = CRGB::Red;
  FastLED.show();                                                          
}else{
  leds[twinkle] = CRGB::Green;
  FastLED.show();                                                           
}
delay(lag);
} // end for loop
}