I used to have netting inside the lids, and it worked great, the one time I lost an Aro during the night happened to be when I was soaking the net in vinegar to remove dyes. My old Gu Kaan would wait until feeding time and ambush me when I opened the lids. My hands were busy once so I bend my forehead over to block his jump and he left a bruise on my forehead from hitting me so hard with his head. That's when you guys told me to slap my fish. I did. It worked, after a few slaps!
I think it's a great idea here, I always thought of a bubble like top to give Aro's room to jump a foot or two like what's natural, it would be awesome to watch them feed on insects and roll and boil at the top.