2D collision not registering

Hi guys, I have tried just about EVERY solution I have found online and havent gotten any positive results on why it is that my 2D trigger-based collision is not working. ' Result of execution: turtle goes right through the gold piece without disabling it.

 using UnityEngine;

alt text using System.Collections; public class playerScript : MonoBehaviour {

     public Rigidbody2D rb;
     public float speed;
     
     // Use this for initialization
     void Start () {
         rb = GetComponent<Rigidbody2D> ();
     
     }
     // Update is called once per frame
     void FixedUpdate () {
 
         if (Input.GetKeyDown (KeyCode.Space)) {
             Debug.Log ("Space key was pressed.");
             rb.AddForce (new Vector3 (0, 300, 0));
 
         } else if (Input.GetKey (KeyCode.RightArrow) && Input.GetKeyDown (KeyCode.Space)) {
             Debug.Log ("Space key and Right Key.");
             rb.AddForce (new Vector3 (10, 30, 0));
         } else if (Input.GetKey (KeyCode.RightArrow)) {
             Debug.Log ("Right key was pressed.");
             rb.AddForce (new Vector3 (10, 0, 0));
         } else if (Input.GetKey (KeyCode.LeftArrow)) {
             Debug.Log ("Right key was pressed.");
             rb.AddForce (new Vector3 (-10, 0, 0));
         } else if (Input.GetKey (KeyCode.LeftArrow) && Input.GetKeyDown (KeyCode.Space)) {
             Debug.Log ("Space key and Left Key.");
             rb.AddForce (new Vector3 (-10, 30, 0));
         }
     }
     void onTriggerEnter(Collider other) {
         if (other.gameObject.CompareTag ("Pick Up"))
         {
             other.gameObject.SetActive (false);
         }
     }
 }