Why do you have a bulkhead on your container of FW
instead of just running the tube up and over the rim? Just curious if there is some reason for it that I never thought of.
Also, how long have you been running your auto-topoff? I have a different kind and the sensor is a bit unreliable (had one minor flood already). Over time my water level in the sump just keeps creeping up (water level sensor saying not enough water when there is already too much).