I have a silver aro in a 120 he is only about 9 to 10 inches right now and I have had him for three months and lately he has been extremely jumpy, he actually jumped out of the back of the tank a couple of days ago while I was standing there. I now have cardboard covering every gap for now so he can't jump out again. I haven't added any new fish and the water parameters are fine. He is still eating like normal just really jumpy. Any suggestions??? Thanks Jamie