I am going to be deployed and away for 6 months. A 12 year old will be in charge of my 150G tank while Im gone. (sigh) I'm replacing my frankensteined together 10g sump and 15g refugium with a new refugium/sump (30 gallon long) and I was wondering if a filter is really necessary? So far I was planning on the return being in the center so I can slow the flow to the refugium. I dont see filters on the sumps on the Melev's website. If you do use a filter sock or sheet, what do you use to hold it in place so its easy to change? My filter sock is a pain to change, its jammed in between my skimmer and the edge of the sump and I have two lines going to the bottom of it. I need something easier or Im sure it will be neglected.