i wouldnt say immpossible, just hard, we need someone who has those stingrays.... (unless you already do...) Do you have a standard 180 gallon or a special 180 gallon? if its standard here are the measurements, i dont know of any "specialized" 180 gallons that has a nice width
72 1/2 x 24 1/2 x 25 5/8 (lxwxh)
72 1/2 x 24 1/2 x 25 5/8 (lxwxh)