Luckily I am predictable and always looking at my tanks.
Had a freak out tonight when I had a look at my tanks, including my favourite CRS tank in the garage! Something just looked off, not quite as active as they normally are. I felt the glass and it was icy!!
It was at 13.5 degrees at 10pm, usually constant at 22.
Because I check them daily I know this wasn't the case yesterday, so my heaters died today at some stage.
Luckily I have a spare heater, or three, so could address the issue quickly.
Everyone looks ok but I guess the next few days will show if they have been stressed out by the experience. I will be devastated if I have big losses in this tank. Any losses in fact.
Just wanted to remind everyone, it's worth checking the tanks as often as possible, especially as the cold weather is hitting hard already!