Fish's new tank project

[untamed]

That dosing pump does sound very nice, but I'm not sure you'll have a lot of luck using for evaporation replacement.

When I first setup an evaporative replacement system, I tried to use a peristaltic pump, figuring that I could dial in the exact amount of evaporation. What I learned, was that I was always wrong. One day, too much..the next...too little.

Evaporation isn't constant. It changes based on environmental humidity and temperature. In the end, I changed over to a float switch based system and it worked better.