Well, as you have already realized, that mouth can open up pretty wide. So, it may well be sooner than you think. I have also known of them to eat some rather expensive tankmates, like for example, a 2 inch ram who wanders to the top for food.
I can't really tell from the pictures how large yours is, just keep in mind there is a reason they are not suggested to live with bite sized tankmates. Good luck though!