So I bought one, and it's supposed to have a red light in heating, green for off. I plugged it in, but from the very beginning, it had no light at all, and seems not to be heating. Is it broken? Should I return it and get another? Or should I get a much more expensive heater? Because to me, it seems the only heaters that don't break, will auto-turn off, and are configurable, are the ones that are highly expensive ($30-40). I'm thinking Aqueon, Eheim Jager, or Hydor Theo (though I heard the last one is prone to breaking).