how much water does a 30 gallon evaporates daily?

[GoFish]

Your Jebao Doser will pump 1ml per second. I'm guessing your tank will require approx 2 litres per day of top off water, but there MANY variables like Scott mentioned. I wouldn't use your Doser for this application. If you wanna use the 4th channel for Foz down I'd just add Foz to a smaller jug mixed with water and dose according to your needs. And then run an adequate ATO with pump for evaporation

Ex: IF you require 2 litres per day you're asking your 4th dosing pump to run for 2000 seconds, that's 33 minutes per day. You'd be asking alot for this type and size of motor IMO