i say lose the festivum, the convicts, and the severum. My gold severum constantly gets beat up by my GT. Like everyone else said the festivum would not last long, and the convicts will just cause too many problems. Thats leaves you with the oscar, the GT, the JD, texas, and the parrot. IMO you with good filteration you could get by with all those fish except for the oscar. if you want the oscar then i would leave out two other fish.