Good. The concept is great. The lip comes out enough where they fall over the exit. The problem is that the top is loose. It is meant to be removed so you can clean it. But the problem here is that small feeders like bsfl can easily squeeze through. Within an hour I was crawling around his pelvis a lot which I tried to stop. Here's what I did, I used a hot glue gun and sealed it on the inside and then covered the outside edges so they couldn't come loose. I give Exoterra 4 stars because the concept was great. But I will say this. Use a ceramic coating on the inside for easier cleaning and seal the top rather than make it removable. Problem solved.
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