This is my first aquarium this large. I never had to use a heater on my nano cube. So any suggestions?? After looking around I am thinking that I might need 2. I have not yet found one rated for my size tank.
I run two 300 watt heaters on my 125 and have been happy for the last two years and a bit. Still have the same two as well. I use two 150 watt heaters for my 90 gallon.