That's one of the reasons, Kim, that we are slowly moving our whole collection into Iris brand tubs (I swear I should get a kickback for promoting this company LOL). They really are glass clear so you get the benefits of a glass tank but none of the hassles of one. The inside of an Iris tub is smooth, no ridges or such like so no more picking feces and hard urates out of some rotten ridged area. A real time saver for me and Mike let me tell you. The other nice thing with Iris is they tend to stay with a tub design so if you build a rack around a certain size, they haven't gone and changed it the next week on you.