Generate sponges in deep oceans in non-v6 mgs

mods/MAPGEN/mcl_biomes/init.lua

@@ -3525,6 +3525,30 @@ local function register_decorations()
 	register_seagrass_decoration("seagrass", 0, 0.5, b_seagrass)
 	register_seagrass_decoration("kelp", -0.5, 1, b_kelp)
 
+	local b_sponge = {"Plains_deep_ocean","SunflowerPlains_deep_ocean","Forest_deep_ocean","FlowerForest_deep_ocean","BirchForest_deep_ocean","BirchForestM_deep_ocean","RoofedForest_deep_ocean","Jungle_deep_ocean","JungleM_deep_ocean","JungleEdge_deep_ocean","JungleEdgeM_deep_ocean","MushroomIsland_deep_ocean","Desert_deep_ocean","Savanna_deep_ocean","SavannaM_deep_ocean","Mesa_deep_ocean","MesaBryce_deep_ocean","MesaPlateauF_deep_ocean","MesaPlateauFM_deep_ocean"}
+	-- Wet Sponge
+	-- TODO: Remove this when we got ocean monuments
+	minetest.register_decoration({
+		deco_type = "simple",
+		decoration = "mcl_sponges:sponge_wet",
+		biomes = b_sponge,
+		spawn_by = {"group:water"},
+		num_spawn_by = 1,
+		place_on = {"mcl_core:dirt","mcl_core:sand","mcl_core:gravel"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0.00495,
+			scale = 0.006,
+			spread = {x = 250, y = 250, z = 250},
+			seed = 999,
+			octaves = 3,
+			persist = 0.666
+		},
+		flags = "force_placement",
+		y_min = mcl_vars.overworld_min,
+		y_max = -20,
+	})
+
 	-- Place tall grass on snow in Ice Plains and Extreme Hills+
 	minetest.register_decoration({
 		deco_type = "schematic",