encrusting corals

Bought some daisies on a piece of rock, has some red sponge and two parts have some kind of encrusting coral i think.. thought the other thing could be some kind of sponge, but it seems to have some polyps.. heres pics dudes and dudettes. If you can't tell very well from the picture...

As the title says, I'm wondering what the best way to frag encrusting corals is. I have two colonies of encrusting porites, one yellow and one red, that are getting larger and I would like to frag them, however, the colonies are growing out encrusting right to the rock. Can I somehow pry off...