If the rock is thin enough just crack it into peices with a chisel.You can also take an exacto knife and try to work it under the zoo mat untill you lift off the zoos you want(real tricky)and last you could just lay the zoos next to another bare rock and let them spread(can take awhile).You can just glue the underside of the zoo matt with crazy glue gel to a rock,making sure not to get any glue on the zoo mouth.
Zoos are a pain if you do lots :rolleyes:

Tina,where did you get those yellow zoos..hmm..might have to talk to ya about those!! :mrgreen:

silly Jim that's a sun coral :mrgreen:

Darn!here I thought it was a zoo,just an old suncoral....oh well. :mrgreen: