Hey, there!

I woke up this morning to discover that my Mag9 return pump had seized up in the middle of the night. Like most folks, my heater is in my sump, so no return pump = no heat. The tank was 73 degrees when I found it, and I've temporarily moved the heater up into the main tank until I get the Mag9 cleaned up and running again. My koralias are moving the surface around just fine, so I'm not worried about gas exchange.

Given that the tank temp normally swings between 78 and 81, do I need to worry too much about a short-term drop of 5 degrees?