diff --git a/Simulation/CancerInvasionSteppables.py b/Simulation/CancerInvasionSteppables.py
index 1890bc5..91fedaa 100644
--- a/Simulation/CancerInvasionSteppables.py
+++ b/Simulation/CancerInvasionSteppables.py
@@ -90,8 +90,8 @@ def initialize_stable_ecm(self):
                     break
                     
                 # Generate fiber with safety checks
-                start_x = random.randint(100, 399)
-                start_y = random.randint(100, 399)
+                start_x = random.randint(100, self.dim.x - 101)
+                start_y = random.randint(100, self.dim.y - 101)
                 angle = random.uniform(0, 2 * math.pi)
                 
                 # Create simple linear fiber
@@ -150,7 +150,7 @@ def initialize_stable_cells(self):
         """Create stable cancer cell cluster"""
         try:
             print("Creating stable cancer cell cluster...")
-            center_x, center_y = 250, 250
+            center_x, center_y = int(self.dim.x / 2), int(self.dim.y / 2)
             target_cells = 50  # Reduced for stability
             
             cells_created = 0
diff --git a/Simulation/__pycache__/CancerInvasionSteppables.cpython-312.pyc b/Simulation/__pycache__/CancerInvasionSteppables.cpython-312.pyc
deleted file mode 100644
index 9876e9d..0000000
Binary files a/Simulation/__pycache__/CancerInvasionSteppables.cpython-312.pyc and /dev/null differ