making models move correctly

I'm trying to apply a code I followed online to a model with different axis (original fish faced in the z axis, new fish faces in the -x axis). using the code below the original fish works fine. when I use it on the new fish however, the fish just move sideways awkwardly. I changed the speed vector to the x axis and the fish move properly, but after that they don't seem to communicate to one another. They just swim around the boundary in a big circle. I'm positive it involves the axis somehow, but I don't know enough about coding to fix it. any suggestions?

fish movement:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class FishMovement : MonoBehaviour
 {
     public FishManager myManager;
     float speed;
     bool turning = false;
 
     // Start is called before the first frame update
     void Start()
     {
         speed = Random.Range(myManager.minSpeed, myManager.maxSpeed);
     }
 
     // Update is called once per frame
     void Update()
     {
         //determine the bounding box of the manager cube
         Bounds b = new Bounds(myManager.transform.position, myManager.swimLimits * 2);
 
         //if fish is outside the bounds of the cube or about to hit something
         // then start turning around
         RaycastHit hit;
         Vector3 direction = Vector3.zero;
 
         if (!b.Contains(transform.position)) 
         {
             turning = true;
            
             direction = myManager.transform.position - transform.position;
 
         }
         else if (Physics.Raycast(transform.position, this.transform.forward * 50, out hit))
         {
             turning = true;
             direction = Vector3.Reflect(this.transform.forward, hit.normal);
         }
         else
         {
             turning = false; 
         }
 
         if (turning)
         {
             // turn towards the center of the manager cube
            
             transform.rotation = Quaternion.Slerp(transform.rotation,
                                                     Quaternion.LookRotation(direction),
                                                     myManager.rotationSpeed * Time.deltaTime);
         }
 
         else
         {
             if (Random.Range(0, 100) < 10)
             {
                 ApplyRules();
             }
         }
         
         // fish movement
         transform.Translate(0, 0, speed * Time.deltaTime);
     }
 
     void ApplyRules()
     {
         GameObject[] gos;
         gos = myManager.fishy;
 
         Vector3 vcentre = Vector3.zero;
         Vector3 vavoid = Vector3.zero;
         float gSpeed = 0.01f;
         float nDistance;
         int groupSize = 0;
 
         foreach(GameObject go in gos)
         {
             if(go != this.gameObject)
             {
                 nDistance = Vector3.Distance(go.transform.position, this.transform.position);
                 if (nDistance <= myManager.neightbourDistance)
                 {
                     vcentre += go.transform.position;
                     groupSize++;
 
                     if(nDistance < 1.0f)
                     {
                         vavoid = vavoid + (this.transform.position - go.transform.position);
                     }
 
                     FishMovement anotherFlock = go.GetComponent<FishMovement>();
                     gSpeed = gSpeed + anotherFlock.speed;
                 }
             }
         }
 
         if (groupSize > 0)
         {
             vcentre = vcentre / groupSize + (myManager.goalPos - this.transform.position);
             speed = gSpeed / groupSize;
 
             Vector3 direction = (vcentre + vavoid) - transform.position;
             if (direction != Vector3.zero)
                 transform.rotation = Quaternion.Slerp(transform.rotation,
                                                       Quaternion.LookRotation(direction),
                                                       myManager.rotationSpeed * Time.deltaTime);
             
         }
     }
 }

Fish Manager:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class FishManager : MonoBehaviour
 {
     public GameObject FishPrefab;
     public float speed = 5.0f;
     private int numberOfFish = 50;
     public GameObject[] fishy;
     public Vector3 swimLimits = new Vector3(5, 5, 5);
     public Vector3 goalPos;
 
     [Header("Fish Settings")]
     [Range(0.0f, 5.0f)]
     public float minSpeed;
     [Range(0.0f, 5.0f)]
     public float maxSpeed;
     [Range(1.0f, 10.0f)]
     public float neightbourDistance;
     [Range(0.0f, 5.0f)]
     public float rotationSpeed;
 
 
 
     // Start is called before the first frame update
     void Start()
     {
         fishy = new GameObject[numberOfFish];
 
        for(int i = 0; i < numberOfFish; i++)
        {
             Vector3 pos = this.transform.position + new Vector3(Random.Range(-swimLimits.x, swimLimits.x),
                                                                 Random.Range(-swimLimits.y, swimLimits.y),
                                                                 Random.Range(-swimLimits.z, swimLimits.z));
 
             fishy[i] = (GameObject)Instantiate(FishPrefab, pos, Quaternion.identity);
             fishy[i].GetComponent<FishMovement>().myManager = this;
        }
         goalPos = this.transform.position;
     }
 
     // Update is called once per frame
     void Update()
     {
         if(Random.Range(0,100) < 10)
         goalPos = this.transform.position + new Vector3(Random.Range(-swimLimits.x, swimLimits.x),
                                                         Random.Range(-swimLimits.y, swimLimits.y),
                                                         Random.Range(-swimLimits.z, swimLimits.z));
 
     }
 
     
 
 
 }