The diet thing is rubbish. It's because a 2-3ft fish has the swimming room of 2-3 times the length of its body. Seeing as how there's nothing at the top to look at, in those crampped quarters; it's eyes will eventually look downward out of curiosity/boredom. It then gets fixated that way because the muscles get lazy, relaxed and stay that way permeanantly. You can't change this through ping pong balls. Because an arowana doesn't care to stare at a ping pong ball, there's no incentive for it to look at it as it doesn't play sports, nor is it interested at it as a food item. If you want to keep an arowana without drop eye here is the trick. Either keep him in a pond. Or lower the water level to half the tank then put mirrors where the glass relflectors are and do this at a young age, not after it has it because this is a prevention method, not a cure. Mirrors where your glass reflectors. YOu don't need to replace your reflectors, just tack large mirrors over your glass reflectors, so the arowana sees itself and it's other tank mates on the surface than having to look down. And lowering your water level which allows the arowana to get more of a distant view of the surface will prevent dropeye period. If the water level is up too high, this limits the paneramic view of the reflection because it's too close to it, that and back splash will cloud up the mirror. Lowering the h20 level avoids some of the backsplash which accumulates that white crusty stuff that you see on the side of you tank and on the reflectors. To hell with ping pong balls and whoever came up with that. Garbage. Fat deposits, garbage too, it's muscle/tendon fixiations than fat deposits. I wish people would put some thought into what they read on the internet, than just recite it. THIS WORKS PERIOD. NO BS.