===================================================================
--- original.js
+++ change.js
@@ -1,30 +1,7 @@
 /**** 
 * Classes
 ****/ 
-// Algae class
-var Algae = Container.expand(function () {
-	var self = Container.call(this);
-	var algaeGraphics = self.attachAsset('algae', {
-		anchorX: 0.5,
-		anchorY: 0.5,
-		alpha: 0.5
-	});
-	var scale = Math.random() * 0.5 + 0.5;
-	algaeGraphics.scale.set(scale, scale);
-	// Set algae speed
-	self.speed = -1;
-	// This is automatically called every game tick, if the algae is attached!
-	self.update = function () {
-		// Move the algae upwards and sideways
-		self.y += self.speed;
-		self.x += Math.sin(LK.ticks / 20) * 0.1;
-		// Reset the position of the algae when it reaches the top
-		if (self.y <= 0) {
-			self.y = 2732;
-		}
-	};
-});
 // Background class
 var Background = Container.expand(function () {
 	var self = Container.call(this);
 	var backgroundGraphics = self.attachAsset('background', {
@@ -306,8 +283,22 @@
 			}
 		}
 	};
 });
+var Reef = Container.expand(function () {
+	var self = Container.call(this);
+	var reefGraphics = self.attachAsset('reef', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = -2;
+	self.update = function () {
+		self.y += self.speed;
+		if (self.y < -self.height) {
+			self.destroy();
+		}
+	};
+});
 // Shield class
 var Shield = Container.expand(function () {
 	var self = Container.call(this);
 	var shieldGraphics = self.attachAsset('shield', {
@@ -369,17 +360,8 @@
 	bubble.y = Math.random() * 2732;
 	bubbles.push(bubble);
 	game.addChildAt(bubble, game.children.length);
 }
-// Create algae after bubbles
-var algaeInstances = [];
-for (var i = 0; i < 20; i++) {
-	var algae = new Algae();
-	algae.x = Math.random() * 2048;
-	algae.y = Math.random() * 2732;
-	algaeInstances.push(algae);
-	game.addChildAt(algae, game.children.length);
-}
 // Spawn the first wave of obstacles
 spawnWave();
 ;
 // Initialize score
@@ -472,8 +454,18 @@
 		obstacle.x = 2048 / 2 + (position.x - gridSize / 2) * cellSize;
 		obstacle.y = 2732 + position.y * cellSize; // Spawn obstacles offscreen at the bottom
 		obstacles.push(obstacle);
 	});
+	// Randomly add reef to either side of the screen
+	if (Math.random() < 0.5) {
+		var reef = game.addChild(new Reef());
+		reef.x = 100; // Left side
+		reef.y = 2732;
+	} else {
+		var reef = game.addChild(new Reef());
+		reef.x = 1948; // Right side
+		reef.y = 2732;
+	}
 	currentWave++;
 	if (currentWave >= obstacleLayouts.length) {
 		currentWave = 0;
 	}
@@ -487,9 +479,5 @@
 var cellSize = 150;
 // Call the spawn wave function every 1 second
 // Initial call to spawn the first wave
 spawnWave();
-;
-// Update algae
-for (var i = 0; i < algaeInstances.length; i++) {
-	algaeInstances[i].update();
-}
\ No newline at end of file
+;
\ No newline at end of file