Issues with randomised objectpool, tag setting and re-setting, general noob issues

Good [insert time appropriate salutation] all.

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~~ TL:DR ~~

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I'm a noob and I'm stuck. My bubbles (GameObjects) won't work properly, they won't set their tag to what is needed when needed, tried a couple things, they didn't work. Don't drink and develop!

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~~ Preface ~~

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I'm a noob with very limited experience coding, and in need of an assist. I'm not adverse to a little bit of RTFM but sometimes I'm not entirely sure I'm picking up what's being put down as it were. I'm not that learned in the design pattern and pipeline/work-flow department yet and have only just seen the power of serialization though still don't have a grasp of it. So when helping me (if you can) please keep it somewhat simple, I'm happy to go learn some more on the non/pre coding stuff too like design patterns and pipeline so if you can point me in a direction that doesn't show me them in C++ you'll have my thanks but that's not the main reason I'm here, see below.

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~~ Game Concept ~~

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Player pops bubbles which match a 'safe' colour chosen at random, if player hits a 'non safe' bubble they lose a life. The 'safe' bubble is changed using a random time of between blah and blah. Simple right? Apparently not for me.

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~~ The Issue ~~

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So I have my objectpool, a List, which is populated by an array of GameObjects. The GameObjects which populate said array are public and get set in Unity Inspector. I have the bubbles spawning randomly from the pool as I want them too. I have the randomisation working. I could be wrong though.

What's going wrong is that if the safe bubble colour changes to lets say purple and a purple bubble already exists/was spawned before the safe colour change, this bubble is not seen as safe.

I also have an issue in that once a bubble is marked as safe it will forever then be safe. I tried to re-set the bubble tag when the bubble gets popped but this had the result of setting all bubbles of that colour to unsafe even though they were chosen as safe

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~~ The Script(s) ~~

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Spawner/Pooler

This script also contains the spawner's spawn location movement and timings.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class MasterSpawner : MonoBehaviour{
     
     public GameObject chosenBubble;    
     public int index;
     public int randomIndex;
 
     public bool willGrow = true;
 
     public List<GameObject>[] pooledObjects;
 
     public GameObject[] bubblePrefabs;
 
     public GameObject purpleBubble;
     public GameObject blueBubble; 
     public GameObject greenBubble; 
     public GameObject redBubble;
     public GameObject yellowBubble; 
     public GameObject pinkBubble;
 
 
     public float timeBetweenSpawns;    
     public float speed = 1.0f;
 
     public float swapTime;    
     public Transform spawnLoc;    
 
     public Vector3 Position1;
     public Vector3 Position2;
 
     public Image BubbleToPopImg; 
     public Sprite red;     
     public Sprite blue; 
     public Sprite purple;
     public Sprite pink; 
     public Sprite green; 
     public Sprite yellow; 
     
     void Awake(){        
         bubblePrefabs = new GameObject[6];
         bubblePrefabs [0] = purpleBubble;
         bubblePrefabs [1] = blueBubble;
         bubblePrefabs [2] = greenBubble;
         bubblePrefabs [3] = redBubble;
         bubblePrefabs [4] = yellowBubble;
         bubblePrefabs [5] = pinkBubble;
 
         chosenBubble = bubblePrefabs[index];
 
         swapTime = Random.Range (4f,6f);
         Randomiser ();
 
         timeBetweenSpawns = Random.Range (0.6f,2.2f);
 
         InvokeRepeating ("Spawn", 0f, timeBetweenSpawns);
 
         pooledObjects = new List<GameObject>[bubblePrefabs.Length];
         for (int i = 0; i < bubblePrefabs.Length; i++){
             pooledObjects[i] = new List<GameObject>();
         }
     }
 
     
      
     public GameObject GetPooledObject(){
         
         randomIndex = Random.Range(0, pooledObjects.Length);
         
         for (int i = 0; i < pooledObjects[randomIndex].Count; i++){
             GameObject go = pooledObjects[randomIndex][i];
 
             if (!go.activeInHierarchy){
                 return go;
             }
         }
 
         if (willGrow){
             GameObject obj = (GameObject)Instantiate(bubblePrefabs[randomIndex]);
             pooledObjects[randomIndex].Add(obj);
             return obj;
         }
 
         return null;
     }
     
     public void Spawn(){
         
         GameObject bubbles = GetPooledObject ();
         
         if(bubbles != null){
             bubbles.transform.position = spawnLoc.transform.position;
             bubbles.transform.rotation = spawnLoc.transform.rotation;
             bubbles.SetActive(true);
         }
 
     }
 
     void Update(){
         
         transform.position = Vector3.Lerp (Position1, Position2, Mathf.PingPong(Time.time*speed, 1.0f));
 
         if(timeBetweenSpawns<=0){
             timeBetweenSpawns = Random.Range (0.6f,3f);
         }
 
         swapTime -= Time.deltaTime;
                 
         if(swapTime <= 0){    
             Randomiser ();
             swapTime = Random.Range (3f,6f);
         }        
         
         switch(index){
         case 5:    BubbleToPopImg.sprite = pink;
                 chosenBubble.tag = "Safe";
             break;        
 
         case 4: BubbleToPopImg.sprite = yellow;
                 chosenBubble.tag = "Safe";
             break;        
         case 3: BubbleToPopImg.sprite = red;
                 chosenBubble.tag = "Safe";
             break;        
 
         case 2: BubbleToPopImg.sprite = green;
                 chosenBubble.tag = "Safe";    
             break;        
 
         case 1: BubbleToPopImg.sprite = blue;
                 chosenBubble.tag = "Safe";    
             break;        
 
         case 0: BubbleToPopImg.sprite = purple;    
                 chosenBubble.tag = "Safe"; 
         break;
         }
         
         chosenBubble = bubblePrefabs[index];
     }
 
     
     public void Randomiser(){
         index = randomIndex;        
         chosenBubble = bubblePrefabs[index];
     }
 }

Popper Script

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class Popper : MonoBehaviour{
     public float fireRate = 1.6f;
     public float speed = 20;
 
     float timeLeft = 5f;
     public int damagePerShot = 1;
     int shootableMask;
     float effectsDisplayTime =1.6f; 
     float timer;
 
     public MasterSpawner masterSpawner;
 
     void Awake (){
         shootableMask = LayerMask.GetMask ("Shootable");
     }
 
     void Update(){
         timer += Time.deltaTime;
 
         if (Input.GetMouseButtonDown (0)) {
             PopShot ();
         }
     }
 
     void PopShot () {
         timer = 1.2f;
 
         Ray toMouse = Camera.main.ScreenPointToRay(Input.mousePosition);
         RaycastHit hitInfo;
         bool didHit = Physics.Raycast(toMouse, out hitInfo, 500.0f,shootableMask);
 
         if (didHit && hitInfo.collider.gameObject.tag == "Bubble") {        
             Bubble bubbleHealth = hitInfo.collider.GetComponent<Bubble> ();
             if (bubbleHealth != null) {
                 bubbleHealth.PopDamage (1, hitInfo.point);
             }
             GM.playerLives -= 1;
         } 
 
         if (didHit && hitInfo.collider.gameObject.tag == "Safe") {        
             Bubble bubbleHealth = hitInfo.collider.GetComponent<Bubble> ();
             if (bubbleHealth != null) {
                 bubbleHealth.PopDamage (1, hitInfo.point);
             }
         }     
 
     }
 }

The popper script is pretty much that as is shown in the Unity Survival Shooter tutorial with some tweaks

and finally the Bubble script

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Bubble : MonoBehaviour {
     public MasterSpawner masterSpawner;
     public int startingHealth = 1;
     public int currentHealth;
     public int scoreValue = 10;
 
     public float popPoint;
     public float spinSpeed;
     public float riseSpeed;
 
     public AudioSource popAudio;
 
     bool isPopped;
 
 
     // Use this for initialization
 
     void Start () {
         /*
         Debug.Log ("I'm a "+ gameObject +
             " The image is "+ masterSpawner.BubbleToPopImg.sprite.ToString() +
             " ~~~ my tag is " + gameObject.tag);
         */
         riseSpeed = Random.Range (0.8f,1.8f) * Time.deltaTime;
         popPoint = Random.Range (10f,20f);
         currentHealth = startingHealth;
     }
 
     public void PopDamage(int amount, Vector3 hitPoint){
         if (isPopped)
             return;
 
         currentHealth -= amount;
 
         if(currentHealth <= 0 ){
             popAudio.Play ();
             GM.score += 10;
             popAudio.Play ();
             gameObject.SetActive(false);
         }
     }
 
 
     // Update is called once per frame
     public void Update () {

  
                transform.Translate (Vector3.up * riseSpeed, Space.World);
         transform.Rotate (Vector3.right * 2* Time.deltaTime);
         transform.Rotate (Vector3.up * spinSpeed* Time.deltaTime);
 
         if(gameObject.transform.position.y >= popPoint ){
             gameObject.SetActive(false);
             popPoint = Random.Range (10f,20f);    
         }    
     }    
 }
 

The bubble script controls the ascent of the bubble, score, auto clearance of the bubble at a certain height and a basic modified version of the Enemy Health script also from the Unity Survival Shooter tutorial.

I added a Debug.Log in the bubbles Start function so each time a bubble spawns it outputs; the gameObject (name of itself); the currently selected safe bubble; this bubbles' tag (to see if it matches the safe colour)

There is also a small issue of coding while inebriated to contend with. In a fit of alcohol infused inspiration I tried to 'fix' things last night and as such I may have made things worse :( Any help will be gratefully received as this has been a bane for a few days now. Thanks in advance.