damn! did they die?  
 
once i had a heater go faulty and stay on - 300watt heater 220l tank, water was at 34c when i noticed, oscar and a pleco, they didn't look happy but they recovered. 
 
i'm just gonna keep direct sunlight off my tank, keep the blinds closed. keep my neighbour happy and my bedroom dark.. i've turned up my heater to maintain the tank at 26-27 even when it's cold so that there won't be such a big fluctuation in temperature every 12 hours. i'll keep the windows to my room open above the tank, and i can see the thermometer from my bedroom. 
  good job mahn! *pats himself on the back*