I do mount my frags on plugs, not because I like them, but they are easier to manage as I allow them to settle and grow out a bit before I sell them.
Plus, plugs are easier to stick into racks so that they don't get blown around as much, as I do have higher flow in my tank, and I don't have a dedicated frag tank.
If I stick the frags on rubble, then they get tossed around so much that I lose them. So they are not great, but sometimes necessary. And people can always remove them as they please.
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