auto top off setup help

leestone · Post by **leestone** » Mon Sep 22, 2025 5:15 pm

I'm setting up an auto top off for my 75 gallon saltwater tank and could use some advice. I've got a Tunze Osmolator but I'm not sure about the best placement for the sensor. Should it go in the sump or the display tank? Also, any tips on avoiding overflows?