Arduino: for loop not working inside of while loop - arduino

Question

I have a set of LEDs 12 in total: 6 are blue, 6 are red. I had for loops that helped with the clutter for turning the LEDs on and off at a set interval. But now I want to make it so it has while loops controlling how long until the LED's speed changes. I have made 2 so far and both of them work but the second I put the for loop inside it doesn't do anything.
int redLEDPins[] = {2,3,4,5,6,7};
int blueLEDPins[] = {8,9,10,11,12,13};
int LED_Amount = 6;
int led_delay = 1000;
unsigned long time_since_last_reset = 0;
int wail = 5000;
int yelp = 3000;
int phaser = 3000;
int hilo = 3000;
void setup() {
for (int i; i < LED_Amount; i++) {
pinMode(redLEDPins[i], OUTPUT);
pinMode(blueLEDPins[i], OUTPUT);
}
Serial.begin(9600);
}
void loop() {
//wail while loop
time_since_last_reset = millis();
while((millis() - time_since_last_reset) < wail) {
led_delay = 250;
Serial.print("delay: ");
Serial.println(led_delay);
digitalWrite(2, HIGH);
delay(500);
digitalWrite(2, LOW);
delay(500);
}
//yelp while loop
time_since_last_reset = millis();
while((millis() - time_since_last_reset) < wail){
led_delay = 50;
Serial.print("delay: ");
Serial.println(led_delay);
for (int i; i < LED_Amount; i++) {
digitalWrite(redLEDPins[i], HIGH);
digitalWrite(blueLEDPins[i], LOW);
Serial.println("Red on ");
Serial.println("Blue off");
}
delay(led_delay);
for (int i; i < LED_Amount; i++){
digitalWrite(redLEDPins[i], LOW);
digitalWrite(blueLEDPins[i], HIGH);
Serial.println("Red off ");
Serial.println("Blue on");
}
delay(led_delay);
}
}

Answer 1

for (**int i**; i < LED_Amount; i++){
digitalWrite(redLEDPins[i],LOW);
digitalWrite(blueLEDPins[i],HIGH);
Serial.println("Red off ");
Serial.println("Blue on");
}
Might that be because you didn't initialize i?