hey every one, im farely new to this and i have a question about refugiums. I currently have a 37 tall aquarium that houses mushrooms, Kolt, flower pot and Zenia. As far as fish, i have 2 clowns, hippo tang chevron tang,6 line wrasse and a cardnial. I am using a CPR Bak-Pak2, Rena canister and 2 sm. power heads(for flow behind the rocks). I am interested in adding a HANG-ON refugium to my system. I need some pros and cons. I would consider a all in 1 sump style as well. I look forward to all your comments. ty--Phil