Predator tank. Much cheaper to operate and aquascape. Can match the colors of marine fish with cichlids such as Rivulatus, Festae, Salvini, Red and Green Texas, with a tank that size maybe Peacock bass. IMO Fresh water allows for more aquascaping options at an incomparable better price. Fresh water fish are less fragile, more adaptable, and easier to medicate than their saltwater counterparts. With an investment like yours, a large generator would probably need to be purchased, if a marine reef is selected, to survive power outages. Freshwater setups are more forgiving.