In that case, I have a 150 gal then because one of my friends gave it to me as a birthday gift and had told me he bought it as a 125 gal. I measured the tank again and the measurements I had given you were correct. I understand that you were not trying to offend me my friend, but I just wanted to make it clear that people here have also told me that I should have a tank that is 6ft long for one arowana..I understand that there are others that disagree but everyone is different so I believe it is what a person thinks is right for their fish. In my opinion, your tank is enough to hold maybe 3-4 because my friend has 3 arowanas and 2 oscars in a 265 gal tank.