noticed today that I had 2 cracks in the tank. the one by the overflow I put my hand on the outside and could feel it inside but not the outside but the outside of the tank is covered by the plastic so I couldn't feel it anyway. then noticed a second crack in the overflow. I felt it with my finger inside the over flow but first thought it was the sealant. but moved my finger and ran it on the outside and felt the crack in the glass on the outside. did contact customer service. and sent pics of it to the rep. the first four is by the overflow. then the next 2 is the crack on the glass in the overflow. then the rest of the pics are the over all pictures of the tank... they also wanted a picture of an anchor that is supposedly on the tank glass. which I haven't been able to find.