I see it more during thunderstorm season here (summer), we don't have a lot of temp shifts then (it's just always hot and humid).I discussed this a little with frank as well. I'm not sure what the actual scientific answer would be on the effects of barometric pressure on a fish tank so i defiantly wouldn't count this out. My thought initially was this, there are more swings in temp when the pressure is changing (front coming through) typically its our temp dropping. if the temp is dropping and the furnace (what we thought may be the issue) is kicking on more because of it there would be a def correlation.
I'm honestly not certain there's a single screw still fully functional here...I think we're all missing a screw. Or at least have a loose one here and there.