Find objects with tag?

Hi,

I made a ui script that instantiates a temporary guitext on an object that receives damage. This works with individual objects, but I want it so that for all gameobjects in the scene with specific tags, a guitext is instantiated above them, at their current position. How would I go about this? I attempted it but with no luck.

Here is my current script:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 using System.Linq;
 
 public class HitPoints : MonoBehaviour {
 
     //the next position to instantiate a point prefab(at the next harmed enemy)
     private Vector2 nextPosition;
 
     //change the UI canvas transform
     public Canvas prefab;
 
     //access the UI text component
     public Text text;
 
     //how much damage to print
     private int _damage;
 
     //an array of enemies, their damage and health
     private GameObject[] enemies;
     private Transform[] _enemyPositions;
     private Health[] _enemyHealth;
     private int[] _enemyDamage;
 
     //offset points from entity center
     public Vector3 offset = new Vector3(0f, 1.5f, 0f);
     
     void Awake () {
 
         //get all enemies in the scene and their health and damage values
         enemies = GameObject.FindGameObjectsWithTag ("Enemy");
 
         //get the health, damage of their weapon, and position and store into array
         for (int i = 0; i < enemies.Length; i++)
         {
             _enemyHealth[i] = enemies[i].GetComponent<Health>();
             _enemyDamage[i] = enemies[i].GetComponentInChildren<EnemyAttack>().damage;
             _enemyPositions[i] = enemies[i].GetComponent<Transform>();
             print(enemies.Length);
         }
     }
 
     void FixedUpdate () {
 
         //as long as there are enemies, execute
         if(enemies.Length > 0)
         {
             print ("there are " + enemies.Length + " enemies.");
 
             //for every enemy
             for(int i = 0; i < enemies.Length; i++)
             {
                 //instantiate a point prefab for every hurt enemy
                 if(_enemyHealth[i].hurt)
                 {
                     nextPosition = _enemyPositions[i].position + offset;
                     text.text = _damage.ToString();
                     //print ("got this far");
                     Canvas hitPoint = Instantiate(prefab, nextPosition, transform.rotation) as Canvas;
                 }
             }
         }
     }
 
     //get damage from weapons
     public void Damage(int dmg)
     {
         _damage = dmg;
     }
 }