Good idea. I don't really like frag plugs, when I have to use them I'll cut off the stem and glue the disc down but they look unnatural. I prefer just gluing to small chunks of rock. Has anyone ever tried acrylic rods for sps frags? I got this idea out of a Reef Hobbiest mag and I'm currently building a rack. 3/16" rods about 2" long, small pieces of airline to prevent them from falling through and an acrylic sheet drilled for about 50 frags.

Neat idea,

I prefer rubble myself though, the issue I see with plugs, discs, etc. is that there is almost never a flat spot on the rock to correspond with the flatness of the plug.

I would also see them being live as a disadvantage. If it's dead and dry then you know at least 1 side of the mount will be dry when you put the glue on to hold the frag in place.