I wish peoplewould sit back and look at an arowana before thinking about putting one in a small/minimum tank. These fish swim, A LOT. A small 6" arowana will easily swim and entire 6 foot tank and get borred. They are a very active fish that require massive amounts of space. To the O.P. Upgrade your tank first to something more suitable, then buy one. You will have a much happier and healthier fish in the end. But make sure you have a large tank/pond for an adult, a 3 foot fish needs plenty of room.