diff --git a/modular_splurt/code/datums/traits/trait_actions.dm b/modular_splurt/code/datums/traits/trait_actions.dm
index 251d300b22..7b86b1ca2f 100644
--- a/modular_splurt/code/datums/traits/trait_actions.dm
+++ b/modular_splurt/code/datums/traits/trait_actions.dm
@@ -1507,7 +1507,8 @@
 	var/mob/living/carbon/human/action_mob = owner
 
 	// Add outline effect
-	action_mob.add_filter("rad_fiend_glow", 1, list("type" = "outline", "color" = glow_color+"30", "size" = glow_range))
+	if(glow_color && glow_range)
+		action_mob.add_filter("rad_fiend_glow", 1, list("type" = "outline", "color" = glow_color+"30", "size" = glow_range))
 
 /datum/action/cosglow/update_glow/Remove()
 	. = ..()
@@ -1532,16 +1533,19 @@
 	glow_color = (input_color ? input_color : glow_color)
 
 	// Ask user for range input
-	var/input_range = input(action_mob, "How much do you glow? Value may range between 1 to 2.", "Select Glow Range", glow_range) as num|null
+	var/input_range = input(action_mob, "How much do you glow? Value may range between 0 to 4. 0 disables glow.", "Select Glow Range", glow_range) as num|null
 
 	// Check if range input was given
-	// Reset to stored color when not given input
-	// Input is clamped in the 1-4 range
-	glow_range = (input_range ? clamp(input_range, 0, 4) : glow_range) //More customisable, so you know when you're looking at someone with Radfiend (doom) or a normal player.
+	// Disable glow if input is 0.
+	// Reset to stored range when input is null.
+	// Input is clamped in the 0-4 range
+	glow_range = isnull(input_range) ? glow_range : clamp(input_range, 0, 4) //More customisable, so you know when you're looking at someone with Radfiend (doom) or a normal player.
 
 	// Update outline effect
-	action_mob.remove_filter("rad_fiend_glow")
-	action_mob.add_filter("rad_fiend_glow", 1, list("type" = "outline", "color" = glow_color+"30", "size" = glow_range))
+	if(glow_range && glow_color)
+		action_mob.add_filter("rad_fiend_glow", 1, list("type" = "outline", "color" = glow_color+"30", "size" = glow_range))
+	else
+		action_mob.remove_filter("rad_fiend_glow")
 
 //
 // Quirk: Rad Fiend