Hello! I have had my tank for about a year now. It is somewhere between 40-50 gallons. The only thing I'm not to familiar with is my sump because I bought the tank already set up from someone, I just transported it to my house. I am interested in having a refugium. I am considering just getting one that hangs on the side of the tank. However I also want to take in to consideration the possibility of one in my sump. Can anyone give me a little information and advice about this sump style and how I might go about making it into a refugium?(I attached photos I hope they work). Inside the sump is a standard return pump and also a UV filter of some sort that is just missing a bulb and being used basically as a tube extension to return water. I don't know much about the UV thing, it was in the tank when I got it. Most information I find online deals with sumps that have the skimmer in the actual sump, mine hangs on the back and instead I have this filter trickle down system. I am also looking for recommendations for hang on refugiums. I am looking at the Finnex multi-use hang on refugium/breeder. (mainly because it is very cheap and I am a broke college student). Just looking to learn a little more about my sump and refugium options. Thanks!