I have an Oscar who is around 7 inches long. He's normally a pretty good fish although he just never seems to be full anymore. He has been pushing his head out of the water a couple of inches and taking the food from my mom's hand. (she has to feed them while I am away at college) I've been telling her to stop it but she doesn't. Today my dad was in a hurry and didn't feed him this morning and my Oscar knocked the lid of the tank up and jumped out. I guess he was on the floor for out 15 minutes. He seems to be doing fine now and was eating OK for dinner. What can I do so he will quit jumping? My mom put some rocks on the lid already.