I will move this thread to another section..
I have very large Silver Dollars, they will feed anywhere in your tank, top, mid water, bottom, any sign of food and they are in there... to the point of bashing each other or into things, other fish etc...
In the past I have had two of mine develop a bruised swimbladder from doing this..... they would lay on their side, go upside down... What I did was, take the fish out of the big tank, into a smaller tank on their own for safety and quiet time, and after 2-3 days the fish came right... It did happen to be a bruised swimbladder and took a few days to come right. JMT