all done

code/datums/components/swabbing.dm

@@ -96,6 +96,8 @@ This component is used in vat growing to swab for microbiological samples which
 	if(!do_after(user, 30, TRUE, target)) // Start swabbing boi
 		return
 
+	LAZYINITLIST(swabbed_items) //If it isn't initialized, initialize it. As we need to pass it by reference
+
 	if(!SEND_SIGNAL(target, COMSIG_SWAB_FOR_SAMPLES, swabbed_items)) //If we found something to swab now we let the swabbed thing handle what it would do, we just sit back and relax now.
 		to_chat(user, "<span class='warning'>You do not manage to find a anything on [target]!</span>")
 		return

code/datums/elements/swabbable.dm

@@ -16,7 +16,7 @@ This element is used in vat growing to allow for the object to be
 	var/virus_chance
 
 ///Listens for the swab signal and then generate a sample based on pre-determined lists that are saved as GLOBs. this allows us to have very few swabbable element instances.
-/datum/element/swabable/Attach(datum/target, cell_line_define, virus_define, cell_line_amount = 3, virus_chance = 10)
+/datum/element/swabable/Attach(datum/target, cell_line_define, virus_define, cell_line_amount = 1, virus_chance = 10)
 	. = ..()
 	if(!isatom(target) || isarea(target))
 		return ELEMENT_INCOMPATIBLE

code/modules/research/xenobiology/vatgrowing/microscope.dm

@@ -15,11 +15,10 @@
 	current_dish = I
 	current_dish.forceMove(src)
 
-/obj/structure/microscope/ui_interact(mob/user, ui_key = "main", datum/tgui/ui = null, force_open = FALSE, \
-									datum/tgui/master_ui = null, datum/ui_state/state = GLOB.physical_state)
-	ui = SStgui.try_update_ui(user, src, ui_key, ui, force_open)
+/obj/structure/microscope/ui_interact(mob/user, datum/tgui/ui)
+	ui = SStgui.try_update_ui(user, src, ui)
 	if(!ui)
-		ui = new(user, src, ui_key, "Microscope", name, 525, 594, master_ui, state)
+		ui = new(user, src, "Microscope")
 		ui.open()
 
 /obj/structure/microscope/ui_data(mob/user)

code/modules/research/xenobiology/vatgrowing/samples/_micro_organism.dm

@@ -30,10 +30,11 @@
 ///Handles growth of the micro_organism. This only runs if the micro organism is in the growing vat. Reagents is the growing vats reagents
 /datum/micro_organism/cell_line/proc/HandleGrowth(var/obj/machinery/plumbing/growing_vat/vat)
 	if(!try_eat(vat.reagents))
-		return
+		return FALSE
 	growth = max(growth, growth + calculate_growth(vat.reagents, vat.biological_sample)) //Prevent you from having minus growth.
 	if(growth >= 100)
 		finish_growing(vat)
+	return TRUE
 
 ///Tries to consume the required reagents. Can only do this if all of them are available. Reagents is the growing vats reagents
 /datum/micro_organism/cell_line/proc/try_eat(var/datum/reagents/reagents)

code/modules/research/xenobiology/vatgrowing/samples/_sample.dm

@@ -41,4 +41,4 @@
 ///Call HandleGrowth on all our microorganisms.
 /datum/biological_sample/proc/HandleGrowth(var/obj/machinery/plumbing/growing_vat/vat)
 	for(var/datum/micro_organism/cell_line/organism in micro_organisms) //Types because we don't grow viruses.
-		organism.HandleGrowth(vat)
+		return organism.HandleGrowth(vat)

code/modules/research/xenobiology/vatgrowing/vatgrower.dm

@@ -17,10 +17,10 @@
 	if(!is_operational() && !biological_sample)
 		return
 	if(biological_sample)
-		biological_sample.HandleGrowth(src)
-		if(prob(10))
-			playsound(loc, 'sound/effects/slosh.ogg', 25, TRUE)
-			audible_message(pick(list("<span class='notice'>[src] grumbles!</span>", "<span class='notice'>[src] makes a splashing noise!</span>", "<span class='notice'>[src] sloshes!</span>")))
+		if(biological_sample.HandleGrowth(src))
+			if(prob(10))
+				playsound(loc, 'sound/effects/slosh.ogg', 25, TRUE)
+				audible_message(pick(list("<span class='notice'>[src] grumbles!</span>", "<span class='notice'>[src] makes a splashing noise!</span>", "<span class='notice'>[src] sloshes!</span>")))
 
 ///Handles the petri dish depositing into the vat.
 /obj/machinery/plumbing/growing_vat/attacked_by(obj/item/I, mob/living/user)