Yea, the first time I fell in love with arowanas is when I saw one for the first time in Pittsburg, my buddy had one and I was like what is that, and hes all its a arowana and I was like, I love that fish.
When I bought my silver the shopkeeper told me to put saran wrap across the top of the tank. I streched it across the back half over all the holes.so far worked great. He's about 7 inches and doing fine.I think if he jumps it might keep him from hurting himself. Also keep heavy objects on top of lid.