I'm using a Apex controller so I have redundancy all over the place as my better half is very anal about that
But if you set the system up and have just enough water to go into the sump and not overfull. and a syphon break as well ( which the regular return will have but since you have a regular forty gallon then you
Will have a normal over top return line
Something like this
https://www.amazon.com/Return-Assem...50-spons&keywords=Aquarium++return+line&psc=1
But if you set the system up and have just enough water to go into the sump and not overfull. and a syphon break as well ( which the regular return will have but since you have a regular forty gallon then you
Will have a normal over top return line
Something like this
https://www.amazon.com/Return-Assem...50-spons&keywords=Aquarium++return+line&psc=1