Ok, is it ok to run two smaller heaters that equal (in total) wattage of one large heater. Reason, I just bought a 55gallon for my office. It came with a cheap useless 200watt glass heater. I have two 100watt stealth heaters that I really like. So, would it be ok to run the two 100 watt heaters in unison vs. running the one big 200watt crap heater?