I have one that has a small pin hole leak in the neck....right where the inlet goes through the acrylic. It is real real slow. The only way I knew it was there was because I saw salt buildup. However, the lastime that I used it was in the sump, so it didn't matter. If you are handy with epoxy and /or silicone it would be an easy fix. The previous owner tried to epoxy it and didn't do it right. Anyway, if you want something like that, you can have it for $70 without the pump. PM me if you are interested.