Certainly one rule that had applied to any Mushroom I had worked with was that a single slice down the middle seemed to be the least intrusive and have witnessed the quickest rebound time. After much contemplation my objective was to cut the specimen in half, and let it heal then cut each piece in half once more. The variable for me was both the healing time and if the polyp would heal at all.
Upon beginning I figured I could try propagating some other Yumas I had here to see if I noticed anything unusual about them or how they reacted to the incision and most importantly how they healed. The first step for me then and now was to provide the propagated specimen with some fresh clean substrate; in this case I use Florida Crushed Coral. I pour a bit into a Solo container, just enough to weight it down in the water. I used the high container because from past experience the frags would come out of the shorter ones from water movement. In the case of this
Yuma that I had grown for months now I would have to separate the base from the plug that it had been growing on. Don't be intimidated convincing the foot to loosen. It’s not that difficult, even if it’s been attached for years. The trick is don’t tear at the disk or foot itself, but slightly pry it off. Actually if you look around the perimeter of the foot you should notice a section that has just enough room to slip in a blunt-edged tool. Take note I said blunt edge, you don't was to lacerate the foot, the coral will have to expend enough energy on other tasks.
You can see in this photo the small rock that was super-glued to the base. That rock initially was as large as the foot itself. Using Superglue is a quick reliable method as long as you are careful. Glue on the base would have burned the tissue and caused an infection to which the coral would not recover. A safer method is a two-part underwater epoxy and actually pinching a small part of the base and adhering this to rock. I see this all the time on Aqua cultured Mushrooms coming from Pelagic Facilities. Next put the specimen on a plastic cutting board. Avoid using wood they can harbor bacteria. Make sure you wet the board with Saltwater from your tank, I find that this aids in some extent in avoiding a lot of sliming. You then want to secure the specimen between two fingers, each on the left and right side of the mouth. Then slowly compress the disk and you should see water expel from the mouth if there is any left. This step could also be done in the tank, but I have a tendency to let them slip through my fingers.
Now the cut, but don't hesitate, and make sure your tool is clean and sharp! Before I cut I typically check the condition of the foot, and try to ensure the cut provides an equal amount of foot for each half. In my case I am using a pair of new, very sharp scissors and am propagating this specimen into four equal-sized pieces.
After waiting about a week I noticed the Yuma’s healing nicely and had not run into any complications during the process. All in all it felt like working with a large bumpy Discosoma. I figured now would be as good as a time as any to emulate this process one more time with the intended. Not much had changed this time around with the exception that I started working with these Beta Breeders by Lee. You can separate them into two or three compartments and with some additional drilling on a press you get some great water movement. I did however need to add some plastic material at the bottom to prevent my crushed coral from falling through the cracks. Oh, and my scissors broke so I will be using a razor blade.
Upon beginning I figured I could try propagating some other Yumas I had here to see if I noticed anything unusual about them or how they reacted to the incision and most importantly how they healed. The first step for me then and now was to provide the propagated specimen with some fresh clean substrate; in this case I use Florida Crushed Coral. I pour a bit into a Solo container, just enough to weight it down in the water. I used the high container because from past experience the frags would come out of the shorter ones from water movement. In the case of this 
loosen. It’s not that difficult, even if it’s been attached for years. The trick is don’t tear at the disk or foot itself, but slightly pry it off. Actually if you look around the perimeter of the foot you should notice a section that has just enough room to slip in a blunt-edged tool. Take note I said blunt edge, you don't was to lacerate the foot, the coral will have to expend enough energy on other tasks. 
tissue and caused an infection to which the coral would not recover. A safer method is a two-part underwater epoxy and actually pinching a small part of the base and adhering this to rock. I see this all the time on Aqua cultured Mushrooms coming from Pelagic Facilities. Next put the specimen on a plastic cutting board. Avoid using wood they can harbor bacteria. Make sure you wet the board with Saltwater from your tank, I find that this aids in some extent in avoiding a lot of sliming. You then want to secure the specimen between two fingers, each on the left and right side of the mouth. Then slowly compress the disk and you should see water expel from the mouth if there is any left. This step could also be done in the tank, but I have a tendency to let them slip through my fingers.
Before I cut I typically check the condition of the foot, and try to ensure the cut provides an equal amount of foot for each half. In my case I am using a pair of new, very sharp scissors and am propagating this specimen into four equal-sized pieces. 
Not much had changed this time around with the exception that I started working with these Beta Breeders by Lee. You can separate them into two or three compartments and with some additional drilling on a press you get some great water movement. I did however need to add some plastic material at the bottom to prevent my crushed coral from falling through the cracks. Oh, and my scissors broke so I will be using a razor blade.