It worked I filled it up and it is now working long term. So the only other things I need to figure out are the float switch and the ATO. Is this what the float switch is supposed to do? Is it in the correct spot?
The red sea float is not to be submerged. Water pressure will push it up to the point where it will be closed and not let water from your gravity fed ATO to come out. Once that white float drops down when water level gets low it will open up and let water from ATO in and fill up that compartment to the point the red sea float goes back up again and closes