Nothing like a temp spike last night to get my behind moving on moving my Apex to a different location.
When I added the chiller, the exhaust was setup to point to the back of the tank so it could exhaust up and out my canopy vent fan.
Unfortunately, that's where my Apex head unit is near and on days where the chiller runs longer, it has overheated my main head unit and caused some odd temp and pH readings.
For some reason the Apex defaults to 18 degrees when it loses connection to the temp probe. So for the better part of 4 hours, my heater, based on the 18 degrees that the overheated apex unit was telling it, was cooking my tank to try to bring up the temp.
Combine that with 3 400-watt MHs and I got up to a whopping 85 degrees in the tank!
Luckily, my ambient temp is 81-82 degrees so it wasn't too crazy of a spike. Oddly, not a single coral/fish has any negative symptoms of the temp spike. Go figure?!
I went ahead and programmed my Apex to not have the heater run if the temp probe reads something ridiculous, like 18 degrees again. That should at least help avoid this near disaster again. I've also relocated the head unit away from the heat exhaust of the chiller.