Well chain pickerel don't get too big, but they get fat and aggressive. By the time mine were about 20 inches they would eat anything in the tank whether it fit in their mouth or not. Once in a while I would wake up to a huge bump in their belly. Other times they would take a full grown yellow perch tank-mate and have a tail hanging out of their mouth for a day or so. Fortunately local fish are easy to replace.
Owain......yes I thought that would be part of the fun of it. Haha, I had to do homework to reconfigure my login!