I purchased a used 120. I purchased poorly. The price was reasonable. I did not take a good look at the glass. It was dirty and I assumed that it was the reason for the cloudiness. This glass is scratched so badly you cannot see through it barely. I was able to save a little by using the back of the tank for the front which is nice and clear. But the sides and the back are so scratched that the water looks cloudy. I have never seen one scratched up so bad. At first I was going to polish it but then I just used the back for the front. The back and sides now look like their dirty. But they are scratched. Guy used a mag float until he ruined the tank I think. Any input or experience with this is welcome.