Will be using a plenum--not sure what to put in my 'fuge

Actually at a 150 gals the 12 to 15 gal fuge is the perfect size and the refugium is the perfect place for the Plenum hence the word refugum a place that is safe a plenum is a wonderful thing but not in a main tank. One rock slip or slide or a burrowing critter open up that cap and poof all gone. If you need help with a coil ? I have a guy here now can't recall his name I know his real name we just went through his entire set up and built a plenum for his frag tank that will be plumbed into the main system.. If you need help building or locating a ready to go NO3 coil P/M me ..