well the frogspawn is in the middle of the troch and bubble, and next to the leather. I am a firm believer in if it need room it will sting or get stung til it creates a void. I have had the bubble sting the frog and the frog sting the leather and they come back just fine after the shock of the sting, usually in about 30 minutes. I personally would not worry about this until there is major die off in one or the other.