I'm running 3 300watt jagers on a 300 gallon rubbermaid. Have them all set to 84 degrees but the tank stays anywhere from 74-76.8. I was hoping to hit closer to 78-80. I would rather run 1 big heater of some type and I really dont want to add yet another jager as i'm out of power sockets lol. I know years ago I had a fireplug heater that worked great but I cant find them. Open to any ideas to heat anything larger.