Do you want cichlids? Red Hooks, Black Bar, or regular silver dollars would work great. Severums, other deep bodied fish would work as well. Looking great!! You've got plenty of circulation it looks like, thats very good!! The more the better...
I'd stay away from Fronts...they can be pretty pricey, and I'm sure you wouldn't be happy if they got the mess knocked outa them. Festae, texas, red devils, pretty much any Parachromis, jack demps, pretty much anything has potential to work. Your pike will be the limiting factor. If he doesn't like the fish, it probably won't work... . The main obstacle you are gonna have is finding fish large enough to go in with him.