Hey guys, I have a 5.5 gallon tank, I want to do a mini reef. I have the tank set up with LR, it has just finished cycling. I have another 5.5 tank sitting around doing nothing, and wanted to do a refugium setup so I could reduce nitrates and grow pods, etc. Im not sure how overflows and return pumps work, Im looking for a general explanation lol (like how to setup pump system, what happens when power goes out/pump fails, etc). The only possible setup is the DT above the refugium. I would rather not run a gravity drain line that involves me drilling a hole into the tank. Thanks in advance 