Hi, thanks to Bobby on Talkshoe for explaining how to do this. If you have time, can you explain it again on this thread. Thanks.

Here's a picture of my Blasto I'm thinking of fragging. Can you place a rock next to a polyp and waiting for it to spread onto the new rock, then splitting it?

http://i106.photobucket.com/albums/m266/helifaxnz/Marine%20Tank/P4144597.jpg

yes you can do it that way, it takes a while though. the coral has to build a skeletal structure onto the other rock.

what i like to do is to get out the dremel with a diamond edged saw type blade, and cut the coral between the polyps to the desired frag size. you will want to add a couple of polyps to the frag size, because usually new frags lose a polyps or two due to the heat from the blade rubbing against them and creating a little tissue damage.
i like to run the dremel saw blade to a depth of about 1/2 of the skeleton of the coral, then around the same section on the bottom creating a grove on the bottom (that makes for a cleaner break), and then break the skeleton with your hands. be sure to grab it as close to the bottom of the skeleton as possible so you do not damage the remaining polyps.

before fragging i also try to get the coral to close its polyps as much as possible so you can see where you want to cut it.

Thanks Bobby. Now to pluck up the courage to do it!

that is the hardest part. after the first time ... you will be a pro and want to frag everything !! let me know if i can be of any more help.