Looks a bit like a deformed mouth. You see this a lot more in EBJD. Other than the slightly strange head, very nice healthy looking fish, Great pattern and fins. Most adult fat Jack Dempseys will have a big arched back, Its that boomarang shape that is caused by stunting and poor conditions. Where the stomach goes in and the head and tail go down. Sick. But this guys healthy, He could be fatter.