I have had my Endli for about 3 weeks and it is around 4-5 inches. It has been eating fine and has suddenly stopped. It wont eat even when food is dropped infront of it. Also, I have noticed that it has been gulping air a lot lately. The tank is well filtered and cleaned weekly with a large powerhead to airate the water. I think it may be swallowing the air because it floats at the top sometimes and looks to have a small lump in its stomach area about a half an inch behind its head. I am not sure if something is wrong or if this is just something that needs to be waited out..