This really depends on the individual corals that you're interested in. Soft corals can be tied down until they attach, hard corals can be glued down with superglue (Loc-Tite from Walmart is the best, IMO
has a lot of info on fragging which generally includes info on attaching the corals to rock. As you see a coral you're interested in keeping do some reasearch, ask some questions... do some more research... you get the idea!
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