Remove biome from World.

Hi, i made a Biome for a dimension, but it is generating on normal world, but i dont wanna this.

I want just generate on my dimension.

CODE:

BiomeGenDarkness.java

package com.darknessmod.world;

import java.util.List;
import java.util.Random;

import com.darknessmod.blocks.DBlocks;

import net.minecraft.block.Block;
import net.minecraft.init.Blocks;
import net.minecraft.world.World;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.world.biome.BiomeGenBase;
import net.minecraft.world.gen.feature.WorldGenAbstractTree;

public class BiomeGenDarkness extends BiomeGenBase{

public BiomeGenDarkness(int par1) {
	super(par1);
	this.spawnableMonsterList.clear();
        this.spawnableCreatureList.clear();
        this.spawnableCaveCreatureList.clear();
        this.spawnableWaterCreatureList.clear();
        this.topBlock = DBlocks.DarkGrass;
        this.fillerBlock = DBlocks.DarkDirt;
        this.waterColorMultiplier = 0x000000;
        this.theBiomeDecorator=new BiomeDecoratorDark();
}

    @SideOnly(Side.CLIENT)
    public int getSkyColorByTemp(float par1)
    {
        return 0;
    }
    
    public WorldGenAbstractTree func_150567_a(Random random)
    {
	return new WorldGenDarkTrees(false, 5, DBlocks.DarkLog, DBlocks.DarkLeaves);
    }

}

DarknessMod.java

package com.darknessmod;

import net.minecraft.world.biome.BiomeGenBase;
import net.minecraftforge.common.BiomeDictionary;
import net.minecraftforge.common.DimensionManager;
import net.minecraftforge.common.MinecraftForge;

import com.darknessmod.blocks.DBlocks;
import com.darknessmod.blocks.DBlocksRecipes;
import com.darknessmod.items.DItems;
import com.darknessmod.items.DItemsRecipes;
import com.darknessmod.world.DarknessWorldConfig;
import com.darknessmod.world.WorldProviderDarkness;
import com.darknessmod.world.BiomeGenDarkness;

import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.SidedProxy;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import cpw.mods.fml.common.event.FMLPreInitializationEvent;
import cpw.mods.fml.common.registry.GameRegistry;

@Mod(modid=DarknessMod.MODID, name=DarknessMod.MODNAME, version=DarknessMod.VERSION)
public class DarknessMod {

public static final String MODID = "darknessmod";
public static final String MODNAME = "Into Darkness Mod";
public static final String VERSION = "1.0.0";

public static final String CLIENTPROXYLOCATION = "com." + MODID + ".ClientProxy";
public static final String COMMONPROXYLOCATION = "com." + MODID + ".CommonProxy";

@Mod.Instance("darknessmod")
public static DarknessMod darknessmod;

@SidedProxy(clientSide = DarknessMod.CLIENTPROXYLOCATION, serverSide = DarknessMod.COMMONPROXYLOCATION)
public static CommonProxy proxy;

public static BiomeGenBase BiomeGenDarkness = new BiomeGenDarkness(35).setBiomeName("Darkness");;

@Mod.EventHandler
public void preInit(FMLPreInitializationEvent event)
{
	DBlocks.registerBlocks();
	DItems.registerItems();
	DBlocksRecipes.init();
	DItemsRecipes.init();
	DimensionManager.registerProviderType(DarknessWorldConfig.DimID, WorldProviderDarkness.class, true);
	DimensionManager.registerDimension(DarknessWorldConfig.DimID, DarknessWorldConfig.DimID);
}

}