I have a red eyed tree frog and I've noticed that as this plant in his cage grows, it gets harder and harder for me to monitor how much he's eating and find leftovers. So I came upon the bowl method and I want to try it out. So I know you use glass but what exactly would one look like? Can someone post a pic or link to one? And have you had any experience with this method, did it work for you? Thanks.