Stupid mistake

In yesterday's "charcoal agar vs blood agar" test, there's no clony can be seen in the charcoal agar plate - not even a tiny spot; it's just tidy and clear... :( Calm down and think, I realize that I've made a really stupid mistake; I shouldn't have used the ordinary Campy Selective Agar - they all contain supplements, which are actually antibiotics for inhibiting other microbes' growth. Hehhh...so I'll have to make another batch of special charcoal agar without supplement...