Vfx on impact of a raycast??

This is my shooting script:

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerShooting : Photon.MonoBehaviour {

float cooldown = 0;

FXManager fxManager;
WeaponData weaponData;
public Camera cam;

[PunRPC]
public GameObject impactEffectwater;
//public GameObject impactEffectripple;
public GameObject impactEffectrock;
public GameObject impactEffectblood;



void Start()
{
fxManager = GameObject.FindObjectOfType();

if (fxManager == null) {
Debug.LogError("Couldn't find FXManager script");
}


}

void Update () {
if (photonView.isMine)
{
cooldown -= Time.deltaTime;

if (Input.GetButton("Fire1"))
{//Player wants to shoot so SHOOT!
Fire();

}
}
}
[PunRPC]
void Fire()
{
//fxManager = GameObject.FindObjectOfType();
if (weaponData == null)
{
weaponData = gameObject.GetComponentInChildren();
if (weaponData == null)
{
Debug.LogError("Did not find a WeaponData script on child object");
}
return;
}
if (cooldown > 0)
{
return;
}
//Ray ray = new Ray(Camera.main.transform.position, Camera.main.transform.forward );
Ray ray = new Ray(cam.transform.position, cam.transform.forward);
Transform hitTransform;
Vector3 hitPoint;
//if (Physics.Raycast(ray, out hitInfo))
//{
// Debug.Log("We hit: " + hitInfo.collider.name);
//}

hitTransform = FindClosestHitObject(ray, out hitPoint);
if (hitTransform != null)
{
Debug.Log("We hit: " + hitTransform.name);

// we could do a FX animation on the hit location
// DoSmokeEffect (hitInfo.point);
if (hitTransform.gameObject.tag == "waterEx")

{
GameObject impactGO = Instantiate(impactEffectwater, hitPoint, transform.rotation);
Destroy(impactGO, 1f);
}
if (hitTransform.gameObject.tag == "rock")

{
GameObject impactGO = Instantiate(impactEffectrock, hitPoint, transform.rotation);
Destroy(impactGO, 1f);
}

//BLOD EFFECT virker ikke fordi boon har samme hittransform og man kan kun spille med ham lige nu
//if (hitTransform.gameObject.tag == "water1")

//{
// GameObject impactGO3 = Instantiate(impactEffectblood, hitPoint, transform.rotation);
// Destroy(impactGO3, .5f);
//}



Health h = hitTransform.GetComponent();
while (h == null && hitTransform.parent)
{
hitTransform = hitTransform.parent;
h = hitTransform.GetComponent();
}



if (h != null)
{
//h.TakeDamage(damage);


//The RPC (remote calls a function) and shares it with the network. In this case "All" players in the game get the updated parameter: damage - from the health script. (It updates health when and object is hit on everybodys computer)
//h.GetComponent().RPC("TakeDamage", PhotonTargets.All, damage);

PhotonView pv = h.GetComponent();
if (pv == null)
{
Debug.LogError("Missing PhotonView script");
}
else
{
h.GetComponent().RPC("TakeDamage", PhotonTargets.AllBuffered, weaponData.damage);
}

}
if(fxManager != null)
{
DoGunFX(hitPoint);
}
}
else
{
//We didn't hit anything except empty space, but let's do an FX anyway.
if (fxManager != null)
{
DoGunFX(hitPoint);
hitPoint = cam.transform.position + (cam.transform.forward *100f);
}
}


cooldown = weaponData.fireRate;

}

private GameObject Instantiate(object prefab, GameObject impactEffectwater, Vector3 hitPoint, Quaternion rotation)
{
throw new NotImplementedException();
}

void DoGunFX(Vector3 hitPoint)
{

WeaponData weaponData = gameObject.GetComponentInChildren();

//fxManager.GetComponent().RPC("SniperBulletFX", PhotonTargets.All, weaponData.transform.position, hitPoint);
fxManager.GetComponent().RPC("SniperBulletFX", PhotonTargets.All, weaponData.transform.position, hitPoint, weaponData.transform.rotation);



}

Transform FindClosestHitObject(Ray ray, out Vector3 hitpoint)
{
RaycastHit[] hits = Physics.RaycastAll(ray);

Transform closestHit = null;
float distance = 0f;
hitpoint = Vector3.zero;

foreach (RaycastHit hit in hits)
{
if(hit.transform != this.transform && (closestHit == null || hit.distance < distance))
{
//we have hit something that is not us:
//a: not us
//b: the first thing we hit that isn't us
closestHit = hit.transform;
distance = hit.distance;
hitpoint = hit.point;
}


}
//closest hit is now either null,or the closest thing that isn't us.
return closestHit;
}
}