We had one that lasted for almost 8 months. Once we added a sixline wrasse, he started to go downhill. That wrasse just completely eliminated every living pod and mysid shrimp he could find. Ours wouldn't eat frozen or prepared foods -- he would only sift the sand. Even if I would bury food near where he was sifting that day, he wasn't an agressive enough of an eater to outcompete the hermits, as they would always find the food before our twinspot did. He was a great fish... It was really sad he ended up dieing on us... But, if we never would have added that wrasse, we'd probably still have him "hopping" around our sand bed.