i am constructing a 1400 gallon aquarium in my back yard. i live in Florida and have temps of 65f to 90f. i am setting up a heater in the pond so that it can stay around 80 in winter. i am deciding between putting some Oscars bala sharks, or two paroon sharks in the pond. which one of these do u think is best and what size group should i have of the oscars or balas.