Yeah, I had seen that post. Nobody seems to have a real great answer. Maybe that is because there really isn't a good answer other than speculation. I can't stomach the chance of having thousands of dollars of damage in my house so I might call Acqueon tomorrow and see what they say about it. Depending on their answer I guess my next step would be to go inspect the tanks at Petco and see how many suffer from something similar. If most of them do I would have to assume it is par for the course and must be cosmetic only. If the other tanks don't have the issue I guess I'll try and return it and get a new one.