Hi gang, just inherited 2 oscars, round about 9-10 inches a piece. Beautiful looking fish. The previous owner had them for about 1 year. They like to swim around together but on saturday they decided to get territorial with each other and decided to do a hell of a lot of lip locking and pushing eraxh other back n forth. Is this natural? Basically i bought my new tank off ebay but didn't realise the fish CAME WITH IT AND KNOW NOTHING ABOUT THEM. nOW I MUST PUT MY OTHER FISH ON HOLD AS THE OSCARS I'M SURE WILL JUST EAT THEM!! CAN ANYONE HELP ME PLEASE?