flower
Well-Known Member
I want to order an auto top off system. The question I have concerns the pump. I have an aquarium utility pump (submersible) that I use to fill my tank when I do water changes.
The system I was looking at shows the pump as external in the diagram. One tube leading to the reservoir and the other to the fish tank.
I want to know if I can use my submersible pump at the bottom of the reservoir and run a tube to the fish tank. Will that create a suction, and cause the water to return to the reservoir when the pump is shut off by the controller?
Here is a diagram of what they show.
![](https://forums.saltwaterfish.com/data/7/7e/7e434fd3_vbattach221923.jpg/width/525/height/525/flags/LL)
The system I was looking at shows the pump as external in the diagram. One tube leading to the reservoir and the other to the fish tank.
I want to know if I can use my submersible pump at the bottom of the reservoir and run a tube to the fish tank. Will that create a suction, and cause the water to return to the reservoir when the pump is shut off by the controller?
Here is a diagram of what they show.
![](https://forums.saltwaterfish.com/data/7/7e/7e434fd3_vbattach221923.jpg/width/525/height/525/flags/LL)