Evaporation

[gregzz4]

110g total here - 75g open top (covered but vented with inlets and exhaust fan) with an open 3/4 full 50g sump
Currently room is 73, tank is 79, and I go through 2g daily; more when it dips below zero C
Summer I think it's about 1g/day - maybe a bit more

And for those with humidity issues, open a couple windows
I leave a couple cracked open all winter for fresh air (older home), and there's no hint of humidity issues anywhere