Not sure about such a large tank, as mine is smaller, but I would concur to bypass the regular heater types and go to higher wattage "heating elements".
In my 110, I know I'm on steroids with mine, but I have a 800 watt finnex element controlled by my apex.
I, just like everyone else has a tank fried by a heater. I then just said forget it and went with the element. It's been great so far.
From Note 2 on Tap 4