diff --git a/src/reaction_modules/asm3_class Koch.js b/src/reaction_modules/asm3_class Koch.js
index a873425..e5e98b3 100644
--- a/src/reaction_modules/asm3_class Koch.js	
+++ b/src/reaction_modules/asm3_class Koch.js	
@@ -83,8 +83,8 @@ class ASM3 {
       theta_mu_H:     0.07,
       theta_b_H_O:    0.07,
       theta_b_H_NO:   0.07,
-      theta_b_STO_O:  this._compute_theta(0.1, 0.2, 10, 20),
-      theta_b_STO_NO: this._compute_theta(0.05, 0.1, 10, 20),
+      theta_b_STO_O:  this._compute_theta(0.1, 0.3, 10, 20),
+      theta_b_STO_NO: this._compute_theta(0.05, 0.15, 10, 20),
       // Autotrophs
       theta_mu_A:     0.105,
       theta_b_A_O:    0.105,