I have heard that Klonapin can decrease the effects of botox. Should I be worried?

There are no studies showing any reduction in efficacy of either when used simultaneously. As with everything else, these are due to unsubstantiated anecdotal online reports. You likely take clonazepam for anxiety and I would recommend avoiding anything that may exacerbate your anxiety.

I have several patients who take Klonopin and receive effective Botox treatments lasting a normal amount of time, 3-4 months. So in my experience, Klonopin has no effect on Botox treatments or results. "This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."