i have a rtc and a 4 line in my tank with a small arawana. i have the top water fish and the bottom fish covered but im looking for something that will stick in the middle of the tank and will look interesting. I love cichlids but im worried about them messing the the arawana. i was looking at tinfoils and pacu's they appeal to me because they constantly swim and look nice. any other suggestions would be great. thanks guys.