This is my first time dealing with an AIO. I am building a IM 25 lagoon, just put water in it and playing with water level. My question is does it matter how full the back “sump” area is? I’m trying to figure out the proper placement for my ATO sensor. Also does it matter which chamber the sensor goes in and does the fill hose for the ATO need to be in the same chamber as the sensor? Thanks for the help.