Hey everyone, Just got done splitting my
green bubble coral. If anyone wondered how to do it, hopefully this helps you out.

I waited till the lights went out so the coral would shrink as small as possible to keep from damaging the polyp too much.

Got my tools ready, dremel or other rotary tool is needed to cut the skeleton quick and easily. I put the coral in a container of water so I could rinse it off and keep it from drying out too badly.

I cut a notch across the bottom of the skeleton being very careful not to touch the polyp. I switched to a diamond bit from an emory disk to more easily cut the notch deeper. Use some rubber gloves while doing this to minimize numbness, and the smell; helps keep the coral cleaner too. I went halfway through the skeleton to give a deep enough notch to break the skeleton but a shallow enough not tear the polyp when the skeleton broke.
I used a screwdriver to break the skeleton down the notch, make sure it only cracks a little, not enough to tear the polyp, but enough to make sure there are two seperate pieces.

All done, I stuck a bamboo skewer between the two halves to allow the polyp to seperate into two. I will increase the gap every day until the coral becomes two. Probably around 14 days.
Once I get two corals, I plan to split them yet again to have 4. Hopefully splitting them that small will give me a year before I need to do this again. I just split this 2 months ago and it has grown to 10" across; getting too close to some of my other corals.
I plan to upgrade to a larger tank but I want it SPS only, so this coral gets to stay in the 20H.
If anyone needs any further clarification, please ask, I prolly overlooked somthing.