Many moons and no fasting here. But being the planted guy makes me the odd man out most of the time. Some do, some don't. I have noticed they are highly sensitive to chages in ambient room temp wether we like it or not. Triggered my moms and stepbrothers to go on strike as well. Had them raise the room temps about 5-10f and they went back to normal.

So perhaps cooler ambients on the tank cools them just enough to either make their digestion to slow down, or trigger the nesting behavior?