diff --git a/app/main.R b/app/main.R
index 44eddd7..96013f2 100644
--- a/app/main.R
+++ b/app/main.R
@@ -250,7 +250,7 @@ server <- function(id) {
       session_dir
     )
     # Grassland pDT ----
-    # grassland_main_server("grassland_main")
+    grassland_main_server("grassland_main")
 
     ces_server(
       "ces_main"
diff --git a/app/view/ces/ces_main.R b/app/view/ces/ces_main.R
index 891f8f4..66358e9 100644
--- a/app/view/ces/ces_main.R
+++ b/app/view/ces/ces_main.R
@@ -53,6 +53,8 @@ ces_server <- function(id) {
   moduleServer(id, function(input, output, session) {
     ns <- session$ns
     
+    # add observeEvent(input$tab) and put that value in reactiveVal variable, that will be passed to module servers, where You can observeEvent that value change.
+    # Check whether the data are not loaded twice: once in cer_rp, second time in ces_rp_biodiversity and same with biodiversity, then it would be better to load them here and pass them downstream
     
     ces_rp_server("ces_rp")
     ces_biodiversity_server("ces_biodiversity")
diff --git a/app/view/ces/ces_rp_biodiversity.R b/app/view/ces/ces_rp_biodiversity.R
index b3d3ab4..615f3d8 100644
--- a/app/view/ces/ces_rp_biodiversity.R
+++ b/app/view/ces/ces_rp_biodiversity.R
@@ -146,19 +146,25 @@ ces_rp_biodiversity_server <- function(id) {
         html = recreation_occurence_slider_html,
         position = "bottomright"
       ) |>
+      addTiles(
+        urlTemplate = "https://api.gbif.org/v2/map/occurrence/density/{z}/{x}/{y}@1x.png?style=orange.marker&bin=hex",
+        attribution = "GBIF",
+        group = "Biodiversity data"
+      ) |>
       addGroupedLayersControl(
         position = "bottomright",
         baseGroups = c("Open Street Map", "ESRI World Imagery", "Open Topo Map"),
         overlayGroups = list(
           "Recreationalist" = c("Nothing", "Hard", "Soft"),
-          "Biodiversity" = c("Biodiversity hotspots", "Focal species")
+          "Biodiversity" = c("Biodiversity data", "Focal species")
         ),
         options = groupedLayersControlOptions(
           collapsed = FALSE,
           exclusiveGroups = "Recreationalist",
           groupsCollapsable = FALSE
         )
-      )
+      ) |>
+      hideGroup("Biodiversity data")
     
     w$hide()