I am building a fish room one of the tanks needs to be located on the other side of the room; across from the filter. The problem is that there is a door in between the tank and the filter.
The bottom of the tanks will be 36 inches above the ground, the top of the filter will be 28 inches above the ground. I want to run the drain all the way to the floor and run it under the door then come back up to the top of the filter. I know it will drain since it is still bellow the water line. I worry about loosing a lot of flow due the pipe coming back up.
Here is a picture to help illustrate

The bottom of the tanks will be 36 inches above the ground, the top of the filter will be 28 inches above the ground. I want to run the drain all the way to the floor and run it under the door then come back up to the top of the filter. I know it will drain since it is still bellow the water line. I worry about loosing a lot of flow due the pipe coming back up.
Here is a picture to help illustrate
