Rescuing frags from friends crashed tan

So my friend had a nano tank with torch corals, frogspawn, and a fuzzy mushroom but he recently had an alkalinity crash and all the corals detached from their skeletons. He said I could have the frags but I'm at a loss as to what to do with them. I pretty much had to shut off all flow in my tank for them to stay in place. Could I glue them to a frag plug or something? Thanks!