This isn't the first time this has happened. Our first emerald cory did the same thing, but much sooner!! It ultimately killed him and we got another one and after having him for 2 weeks, he's getting stuck in it now too. This has never happened to any of our other fish. Why in the heck does this keep happening to our emerald cory catfish? No one's home right now and we won't be for a while and I have a feeling he got stuck again and he's going to be dead when we get home at 7.

All of our other fish swim by it and they're just fine. I just don't get it. We have a 55 gallon tank and a Petco brand 65 gallon filter.