Cannot reference a script on an array of gameobjects generated in another script

I want an array of game objects, each game object has a simple script to move it. I want a controlling script to be able to trigger the remote script by referencing the array coordinates / game object at that point.

I am missing something basic in referencing a "global" variable - so apologies in advance. I have spent several hours now reading and trying things out. Example questions like here Accessing a variable from another script C# or https://answers.unity.com/questions/42843/referencing-non-static-variables-from-another-scri.html

I believe the array should be static as there is only one set of data, however I don't care if it isnt

CreateGrid.cs

public class CreateGrid : MonoBehaviour { public static GameObject[,] gridArray = new GameObject[5, 5]; public GameObject gridSpace; // Start is called before the first frame update void Start() { GenerateGrid(); } void GenerateGrid() { for (int x = 0; x < 5; x++) { for (int z = 0; z < 5; z++) { gridArray[x, z] = Instantiate(gridSpace, new Vector3(x, 0, z), Quaternion.identity) as GameObject; } } // test grid works // gridArray[2, 2].transform.Translate(0.0f, 3.0f, 0.0f); } 

}

test code

public class Pulse : MonoBehaviour { // Start is called before the first frame update void Start() { for (int x = 0; x < 5; x++) { CreateGrid.gridArray[x, 3].GetComponent<MoveObject>().StartBounce(5.0f); } } } 

The grid of objects works. However the test code errors with Object reference not set to an instance of an object from the line CreateGrid.gridArray[x, 3].GetComponent().StartBounce(5.0f);

specifically CreateGrid.gridArray

Given that I seem to be really struggling with a concept, please explain clearly.

Thanks