You simply use a sharp blade to slice off a small pc. ( approx. 1/4 or 1/5 from the whole ) either glue directly to a rubble ( not always workable ) or to place it inside a small clear plastic container without cap together with a rubble inside for it to anchor naturally and to place the algae or holder to a position without strong flow and intense light. The new frag will take a week more or over a month to be noticeable any growth depends on enough of nutrients obtained from the existing water column. HTH
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