The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
I personally don't see cause for concern. 3 of my 7 Otos are fatter than that (normal for females I believe) and have been for months. They're all happy, healthy and active. Unless you see changes in behavior, I wouldn't worry.