I've used this method with some success:
Get some fine guage hypodermic needles (just the needles, give the syringes to some junkie friends.

jk.gif" border="0" alt="" title="Just Kidding" class="inlineimg" /> ). Take some wide rubber bands and cut them up into little sections so thatyou have little squares of rubber band. Thread a square piece of rubber band to every needle. Take some
live rock rubble and place your
frag on it and puncture the
frag and pin it against the rock then slide the rubber square down so that it helps hold it against the the rock. Place it where its going to get continuous but gentle flow, maybe near a spray bar and keep an eye on it.
Hope this helps