So I did a water change on my 220 Tuesday evening and yep forgot to plug the heater back in. Needless to say when I went to feed Wednesday afternoon the Tank was 70 which I didn't think was too bad since the basement is in the low 60s. I usually keep the temp at 78 but the fish were no worse for wear, they ate like pigs still and it didn't seem to phase them. So I just plugged it back in and it took about 6 to 8 hours to heat it back up with the 1000w heater I have in it.