Two Objects Touching?

What is the best way to check if two objects, both with colliders, may have spawner on top of or next to each other, I tried using an algorithm where I find the short distance from one object to the closest tagged object however all the objects share the same tag so it always returns itself as the closest object?

Is there a way I can exclude the object the script is on from the array which is being created by finding tagged objects?

OR

Is there a way I can check collisions for objects that instantiate on top of or near to each other? My biggest problem with the collision functions in this case is that they don't actually collide (the objects) do they need a rigidbody to work properly? Ill post my script bellow nicely commented so people can understand.

 var thisG : GameObject;
 var enemies : GameObject[];
 var closestEnemy : GameObject;
 var dister : float = 1000;
 var dist : float ;
 var destroyer : float = 0.4;
 var timer : float = 0;

 function Start () {
 
 }
 
 function Update () {
         //The timer is to allow everything to spawn first
     timer += Time.deltaTime;
         // Creates an array of all the tagged objects
     enemies = GameObject.FindGameObjectsWithTag("arno");
     if(timer > 1){
     if (enemies.length > 0){
         var closestEnemy = enemies[0];
         var dister = Vector3.Distance(thisG.transform.position , enemies[0].transform.position);;    
         for (var m = 0; m < enemies.length;m++){
             var tempDist = Vector3.Distance(thisG.transform.position , enemies[m].transform.position);
             if (tempDist == 0){
         
         }else{
             if (tempDist < dister){
                 closestEnemy = enemies[m];    
                 //used to find the closest enemy
             }
         }
     }
     dist = Vector3.Distance(thisG.transform.position , closestEnemy.transform.position);
 }else{
     dist = 1000;    
 }
 if(dist == 0 ){
 
 }else{
     if (dist < destroyer){
             // if the enemy is to close to another enemy on spawn it destroys it
     Destroy(closestEnemy);
     Destroy(thisG);
     }
 }
     }
 }

 function OnCollisionEnter(hit : Collision) { // This whole function doesn't work i just kept it in the code to see if someone can edit it 
     
         if (hit.gameObject.tag == "arno"){
             Destroy(thisG);
     }
         
 }