Set up a gravity ATO with Auto Water Filler, Don't Need Power, Easy Setup by Marinecolor, $14, seem to be losing 0.5L/day to evaporation. ... Do I need an RO/DI system?
Get ~0.5L evaporation per day.
20180729 am: Started doing 0.25L water changes daily.
Automated daily 0.5L water changes and auto-top off for both SW and FW aquariums with Jebao DP-4 Dosing pump.