Cannot destroy the SphereCollider on Instantiated Objects

Hey,

I currently have made a script which instantiates 20 objects (stars). The issue is that I want to destroy then add a SphereCollider on each other objects but I can't got it to work. My function below:

public void SpawnStars() { //Debug.Log("The Size of the Array is " + SpawnPoints.Length); Vector3 randomPosition;

     while (starscloned == false) 
     {
         randomPosition = new Vector3(Random.Range(-400f, 400f), Random.Range(100f, 400f), Random.Range(-400f, 400f));
         //The Vector called randomPosition is randomly assigned X, Y and Z co-ordinates by the "Random.Range" function.
         // The generated Y co-ordinate must be between 0 and some number because a star can never be below the horizon.
         //https://forum.unity3d.com/threads/randomly-generate-objects-inside-of-a-box.95088/

         randomPosition = transform.TransformPoint(randomPosition * 2.5f);
         // The randomPosition is maximised and scaled appropriate to the scene.

         newClone = Instantiate (stars, randomPosition, SpawnPoints [spawnIndex].rotation);
          //Instantiate generates a clone of an object. The function is divided into 3 components;
          //Object, Position, Roation
          //The object is the model which is being cloned
          //The Position is the position where the object will be spawned
          //Quaternion is the rotation component of the new spawn


         newClone.name = ("StarClone" + spawnIndex);
     
         sphereCollider = newClone.GetComponent<SphereCollider>();
         sphereCollider.enabled = false;
         Destroy(sphereCollider);

         //newClone.AddComponent<SphereCollider> ();
         //newClone.GetComponent<SphereCollider> ().enabled = true;
         //newClone.GetComponent<SphereCollider> ().center = Vector3.zero;
         //newClone.GetComponent<SphereCollider> ().radius = 1f;

         // The new Object is intrinsictly named for future use

         spawnIndex = spawnIndex + 1;
         //Essentially a counter in itself

         if (spawnIndex == SpawnPoints.Length) {
             starscloned = true;
         } else {
             //other.Classify ();
         }
     }
     //Debug.Log ("The clones have been created and the loop has been exited.");
 }

Any idea's would be appreciated. Thanks heaps!