diff --git a/core/src/mindustry/content/Liquids.java b/core/src/mindustry/content/Liquids.java
index 679bda6552..5a3a338133 100644
--- a/core/src/mindustry/content/Liquids.java
+++ b/core/src/mindustry/content/Liquids.java
@@ -51,6 +51,7 @@ public class Liquids{
             viscosity = 0.85f;
             flammability = 0.1f;
             capPuddles = false;
+            hidden = true;
 
             colorFrom = Color.valueOf("f98f4a");
             colorTo = Color.valueOf("9e172c");
diff --git a/core/src/mindustry/content/UnitTypes.java b/core/src/mindustry/content/UnitTypes.java
index f96aa366ba..537cd8db5a 100644
--- a/core/src/mindustry/content/UnitTypes.java
+++ b/core/src/mindustry/content/UnitTypes.java
@@ -1236,7 +1236,7 @@ public class UnitTypes{
         //region air support
 
         mono = new UnitType("mono"){{
-            defaultController = MinerAI::new;
+            unitBasedDefaultController = u -> new MinerAI();
 
             flying = true;
             drag = 0.06f;
@@ -1255,7 +1255,7 @@ public class UnitTypes{
         }};
 
         poly = new UnitType("poly"){{
-            defaultController = BuilderAI::new;
+            unitBasedDefaultController = u -> new BuilderAI();
 
             flying = true;
             drag = 0.05f;
@@ -1310,6 +1310,7 @@ public class UnitTypes{
         }};
 
         mega = new UnitType("mega"){{
+            //TODO control?
             defaultController = RepairAI::new;
 
             mineTier = 3;
@@ -3318,6 +3319,7 @@ public class UnitTypes{
             isCounted = false;
             allowedInPayloads = false;
             logicControllable = false;
+            playerControllable = false;
             envDisabled = 0;
             payloadCapacity = 0f;
 
diff --git a/core/src/mindustry/type/Liquid.java b/core/src/mindustry/type/Liquid.java
index dddde8968d..c7d9a2f9bc 100644
--- a/core/src/mindustry/type/Liquid.java
+++ b/core/src/mindustry/type/Liquid.java
@@ -57,6 +57,8 @@ public class Liquid extends UnlockableContent implements Senseable{
     public boolean capPuddles = true;
     /** Effect when this liquid vaporizes. */
     public Effect vaporEffect = Fx.vapor;
+    /** If true, this liquid is hidden in most UI. */
+    public boolean hidden;
 
     public Liquid(String name, Color color){
         super(name);
@@ -89,6 +91,11 @@ public class Liquid extends UnlockableContent implements Senseable{
         }
     }
 
+    @Override
+    public boolean isHidden(){
+        return hidden;
+    }
+
     public int getAnimationFrame(){
         return (int)(Time.time / (gas ? animationScaleGas : animationScaleLiquid) * animationFrames + id*5) % animationFrames;
     }