thats just wrong......that grouper has no business in that tank, especially if its 40 lbs which i doubt it is, a 40 lb grouper is big.
http://www.putfile.com/pic.php?img=7271717
http://www.putfile.com/pic.php?img=7271718
one picture is an american red snapper that is 26" or 27" and probably weighs 10 lbs or a little under, the other is a red grouper that is around 24" and weighs 10 lbs or less. you can imagine how big a 40 lb grouper would be.