hello everyone this is my first post. I am considering getting a 300 gallon stock tank. I live in south Florida so the winters aren't to cold but the fish i will be keeping, (Oscars) need warm water nothing below 75f. i will be putting this stock tank into the ground. is there any way i could add more insulation to the stock tank ho sould i go about heating it. will multiple aquarium heaters be enough? i was considering using a small spa heater but i want to hear all of your opinions. Any advice is appreciated, thanks.