Fragging acans with a wet tile saw?

[NewFavia]

Hi nano reefer's I just bought a colony of green and purple acan lords has about 70 heads on it but I only wanted 5 or 10 heads so I need to frag it to make room for more acans.

 

so my question is how to do this with a wet tile saw propley? any tricks etc water type to put in the wet saw so I ether don't destroy the coral or saw? (saltwater, tap, RO water) also is there a cutting Technique? and last question how long does it take to heal on average to be able trade them off as I don't have much space in my 25 litre (6.6gal) long tank thanks