[SOLVED]OverlapingSphere damage only one enemy

Questions & Answers
1

I have this code:

        private Enemy targetEnemy;
        private string enemyTag = "Enemy";
        public int spellDamageOverTime = 500;
        public int spellDamageRadius = 20;
        [HideInInspector]
        public Transform thisSpellTarget;
        public GameObject spellTarget;
        
        void Update ()
        {
            if(thisSpellTarget != null)
            {
                Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
    
                RaycastHit hitInfo;
                if (Physics.Raycast(ray, out hitInfo))
                {
                    thisSpellTarget.transform.position = hitInfo.point;
                }
    
                GameObject[] enemies = GameObject.FindGameObjectsWithTag(enemyTag);
    
                foreach (GameObject enemy in enemies)
                {
                    targetEnemy = enemy.GetComponent<Enemy>();
                }
            }
    
            if (Input.GetMouseButtonDown(0) && thisSpellTarget != null)
            {
                //Debug.Log("Mouse clicked");
                Destroy(thisSpellTarget.gameObject);
    
                StartCoroutine(SpellDOT());
            }
        }
    
        public void SpellButtonAction()
        {
            thisSpellTarget = ((GameObject)Instantiate(spellTarget)).transform;  
        }
    
        private IEnumerator SpellDOT()
        {
            Collider[] colliders = Physics.OverlapSphere(thisSpellTarget.transform.position, spellDamageRadius);
    
            foreach (Collider collider in colliders)
            {
                if (collider.tag == "Enemy")
                {
                    //Debug.Log(targetEnemy);
                    //Debug.Log(spellDamageOverTime * Time.deltaTime);
                    targetEnemy.TakeDamage(spellDamageOverTime);
                }
            }
    
            yield return new WaitForSeconds(3f);
        }

It only damage 1 enemy at the margin of the sphere and ignore the others. Also

spellDamageOverTime * Time.deltaTime

return 6.1

2

I had to add

targetEnemy = collider.GetComponent<Enemy>();

inside the collider if statemen