I am about to redo my sump and would like to add a refugium. The sump is a 55g aquarium. Ideally, I would like the refugium to be a 55g aquarium as well. My question is this: Is there a way to safely get gentle water flow and water return between the 2 tanks if they are at the same level on the ground? The only way I can come up with is to use a shut off sensor but I'm worried about these failing. Any thoughts?