This vid is from June 26, Just shortly after I got it.
You can see it at around 2:50 thru 2:60. It is only around 1.5"
http://www.youtube.com/watch?v=ATThbg4CGtc
This video is from November 22, approx 6 mths later
Close up at 0:48
http://www.youtube.com/watch?v=82rPEl0_mzo
Not too bad in a 33 gal tank with only T5HO's