diff --git a/pom.xml b/pom.xml
index 88893f9..b5bcdea 100644
--- a/pom.xml
+++ b/pom.xml
@@ -47,7 +47,7 @@
         <!-- Revision variable removes warning about dynamic version -->
         <revision>${build.version}-SNAPSHOT</revision>
         <!-- This allows to change between versions and snapshots. -->
-        <build.version>1.9.3</build.version>
+        <build.version>1.9.4</build.version>
         <build.number>-LOCAL</build.number>
         <sonar.projectKey>BentoBoxWorld_Greenhouses</sonar.projectKey>
         <sonar.organization>bentobox-world</sonar.organization>
diff --git a/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java b/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java
index b41efe5..515fafa 100644
--- a/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java
+++ b/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java
@@ -403,8 +403,9 @@ public boolean spawnMob(Block b) {
         return getRandomMob()
                 // Check if the spawn on block matches, if it exists
                 .filter(m -> Optional.of(m.mobSpawnOn())
-                        .map(b.getRelative(BlockFace.DOWN).getType()::equals)
+                        .map(getEffectiveBlock(b.getRelative(BlockFace.DOWN))::equals)
                         .orElse(true))
+
                 // If spawn occurs, check if it can fit inside greenhouse
                 .map(m -> {
                     Entity entity = b.getWorld().spawnEntity(spawnLoc, m.mobType());
@@ -425,6 +426,19 @@ public boolean spawnMob(Block b) {
                 }).orElse(false);
     }
 
+    /**
+     * Get the effective block material, allowing bubble columns to act as water.
+     * @param b - block to check
+     * @return the block
+     */
+    private Material getEffectiveBlock(Block b) {
+        // Treat Bubble Column as water
+        if (b.getType() == Material.BUBBLE_COLUMN) {
+            return Material.WATER;
+        }
+        return b.getType();
+    }
+
     /**
      * Prevent hoglins and piglins from zombifying if they spawn in the overworld
      * @param entity - spawned entity
diff --git a/src/main/java/world/bentobox/greenhouses/managers/EcoSystemManager.java b/src/main/java/world/bentobox/greenhouses/managers/EcoSystemManager.java
index 8ca43e2..7665b9d 100644
--- a/src/main/java/world/bentobox/greenhouses/managers/EcoSystemManager.java
+++ b/src/main/java/world/bentobox/greenhouses/managers/EcoSystemManager.java
@@ -241,16 +241,14 @@ protected List<GrowthBlock> getAvailableBlocks(Greenhouse gh, boolean ignoreLiqu
             for (double z = ibb.getMinZ(); z < ibb.getMaxZ(); z++) {
                 for (double y = ibb.getMaxY() - 1; y >= bb.getMinY(); y--) {
                     Block b = gh.getWorld().getBlockAt(NumberConversions.floor(x), NumberConversions.floor(y), NumberConversions.floor(z));
-                    if (checkBlock(result, b, ignoreLiquid)) {
-                        break;
-                    }
+                    checkBlock(result, b, ignoreLiquid);
                 }
             }
         }
         return result;
     }
 
-    private boolean checkBlock(List<GrowthBlock> result, Block b, boolean ignoreLiquid) {
+    private void checkBlock(List<GrowthBlock> result, Block b, boolean ignoreLiquid) {
         // Check floor blocks
         if (!ignoreLiquid) {
             // Check ceiling blocks
@@ -264,15 +262,12 @@ private boolean checkBlock(List<GrowthBlock> result, Block b, boolean ignoreLiqu
                             )
                     ) {
                 result.add(new GrowthBlock(b.getRelative(BlockFace.UP), true));
-                return true;
             }
         } else {
             if (!b.isEmpty() && !b.isLiquid() && b.getRelative(BlockFace.UP).isLiquid()) {
                 result.add(new GrowthBlock(b.getRelative(BlockFace.UP), true));
-                return true;
             }
         }
-        return false;
     }
 
     private int getBoneMeal(Greenhouse gh) {