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You have now finished the first part, and you have either placed the coral back in the water or it is still in tray. If it is still there you may wish to continue with the next step. If it is not, and you decided that you wanted to place the coral back in the water for a while, that is fine too. At some point though you will need to continue and the sooner you do the better in my experience.

Second Step

• Now that we have a groove that runs around the skeleton of the bubble coral we can continue the procedure,
• What we are going to do now is use the other drill bit and slowly but very slowly, drill deeper and do so at the bottom of the skeleton until we actually pass through the hard/coral part,
• To do so drill along the bottom over a width of about one inch, going from one side to the other, applying a little pressure so you go in deeper and deeper,
• As you do this you will find that after a very short period of time you actually are through the skeleton and have an opening of approximately one inch,
• The next step is to take the wedge and insert it in the hole and push it in with the pliers,
• Do so gently, very gently,
• Apply pressure and push it in a little deeper each time,
• You may need to rock the wedge back and forth a little to get it to go in deeper,
• Once it goes in deep enough, and because a wedge is really V shaped and gets thicker, the pressure on the skeleton increases. Do not push the wedge in forcefully in one swift movement. Do so little by little and a fraction more and more at a time,
• At some point the skeleton will break,
• It fractures along the groove that you previously made,
• You will hear it when it happens, and you may be surprised or shocked the first time you do this. Don't worry if you do this again you will soon get used to this,
• Because you are going slowly and because coral polyp is very flexible you are actually not hurting the polyp or rupturing it,
• Once the skeleton has cracked you have finished step two of the process and you now really have a large polyp and two pieces of skeleton
• The next step will be to place the coral back in the tank in a particular fashion as I will explain as we go along.
• The inside plates which are much thinner will crack automatically too. That is what we want as we want two pieces of skeleton. The polyp is still attached of course and will remain attached. The split occurs later.

Third Step

We are now placing the coral back in the aquarium,
• There is a particular way to do this as we want the two parts of the skeleton to be drawn apart and offset against each other,
• To do this you will need the small plastic wedges
• Insert the wedges around the coral skeleton so the two parts do not touch each other
• Insert them gently so you do not damage anything (mainly the polyp)
• Insert them far enough so they remain in place and insert about a quarter of the way of their thickness. This ensures that the two parts of the skeleton to not touch each other and would have a chance to re-cement together
• Now place the coral in the water, with one part of the skeleton being placed a little lower than the other part (about half an inch to three quarters of an inch difference is fine)
• Hopefully you have selected a place in the tank for this in advance so you have the offset you need
• Basically after it is placed in the tank the coral looks like:

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• The left part if higher than the right part, or vice-versa. Which way you do it is not important as long as you have the offset and the wedges in place. The space between the two lines indicates the tension you are introducing on the polyp so it stretches. Both are meant to force the polyp to split in two parts and it will eventually do so. Believe me I have done it numerous times.

What is next?

We have split the skeleton and we have it back in the tank as described above.

Because of the offset and the wedges, tension is created on the polyp and that will make the polyp stretch.

For the Bubble coral to split in two, we will need to increase that tension and that offset little by little, day after day, until the split starts to occur.

Note that you may wish to look at a skeleton of a dead bubble coral if you get a chance to see how its structure is and how it is more fragile towards the top than at the bottom. That is obviously the reason most of our efforts are concentrated at the bottom so we minimize the possibility of harming the polyp which is more concentrated towards the top.

As the tension is increased and has the pieces are farther apart and as the offset in increased as well, you will start noticing after a while that the polyp actually starts to split. When that happens you know that you will soon have two bubble corals. The split starts with an indentation in the polyp, sort of like a large V on both sides and the narrow ends of the V will work towards each other and expand until they meet. When they do you have basically two corals.

How long does this all take?

I have had instances where the split was as short as 10 days and others where the split took nearly 3 weeks. The speed depends on your expertise with this and the amount of offset and tension you introduce.

In the beginning or what I mean is when you do this for the first time, do everything slowly. As you gain more expertise you can certainly speed the process up by increasing the offset of the 2 frags and the tension on the polyp to speed things up.

Acquire some experience first though and do not pay too much attention to how fast this all happens. The key is to be successful. Once you have done it a few times you can speed things up somewhat as I explained above.

Keep your skimmer running. Do not turn off the lights. Make sure your iodine levels are where they should be and maybe a little higher even. Dose with a complete supplement, such as VG, at twice the recommended dose. Feed the coral during the night or a few hours after the lights are off. Add Plankton at night if you wish. I have found that this is beneficial. If you use plankton make sure it is live. Brachionus is a good choice and can be ordered from AWC or from Florida Aqua Farms.

Where do you get most the implements you need?

I got mine from Home Depot and a Hobby shop. You can find the Dremel Tolls and the drill bits that go with it in many places though. I have tried other shapes than the V, a half round for instance, but have found that the V works best to make the initial groove. The V shape should be a wide one not one of the narrow angle V drills they sell. The second drill is basically a round dot that you use to make the V deeper. The dot drills come in various sizes and I used the small one.

Note that in the beginning I indicated that you should use an adjustable speed drill. The reason is that they are easier to control. Some of the higher end models allow you to set the actual RPMs and that is what I use. If you get a lower end model, get one that has a low speed setting and you will be fine.

The plastic wedges were found at Home Depot but they were larger than what I needed, so I cut them down to the sizes explained above.

Note that the Dremel will be used to propagate other corals so it is a good piece of equipment to have if you plan on doing this to more than one type of coral. You will need other drill bit types and you may wish to consider buying the Dremel kit that comes with an assortment of drill bits in it. That way you have everything you actually need.

Also note that the Bubble coral is one of the more difficult one to do this procedure with. Many other corals that I have applied this method (or a very similar one to, are much easier to propagate. The main reason for this is the make up of the internal parts of the skeleton.

Disclaimers

Since I am not at your place to supervise how you do all of this I cannot take responsibility for your success or failure but if you follow the instructions and do not rush things the first time you should do just fine.

Do not improvise. Follow the directions. After you have gained some experience you can improvise somewhat and perhaps adapt the technique to your own liking. This is a description of how it works for me but that does not mean that you cannot make some modifications to it.

Should you see damage to the polyp, you need to treat with high dosages of Vitamin C and rub some on the wound too. You also want to maintain those high dosages in the water and aim water current at the affected area.

If you break some of the top lamellae, leave them in place. They will come loose by themselves and be ejected by the coral

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