I find this method of growing suits me well. I use well fertilized soil mixed with natural blood and bone meal and a dash of fish emulsion. I also tend to use seedlings grafted on Pereskiopsis as Pereskiopsis I have found lends itself particularly well to growing in pure water, bogs, etc. It is hard to kill Pereskiopsis.

I leave the leaves on my Pereskiopsis when I perform my grafts as well as when I grow in bog-ponics. Why? Because Pereskiopsis that has been striped of its leaves push seedlings much slower and I want fast growth.  I enjoy the fact that I can also simply take my Pereskiopsis out of this bog and there is very little transition that has to happen as the soil dries so to does the Pereskiopsis adapt to being grown in dry soil without having to be manhandled which can stunt growth with any plant.

Large healthy leaves makes for more surface area to collect sunlight and thus my cacti seedlings grow very fast. Additionally, those leaves pull the liquid fertilizers I use through the cacti much faster than a Pereskiopsis that is devoid of leaves. This helps me to force pupping quickly.

Many stay constantly in the bog. However, I will let some of my Pereskiopsis sit outside of the bog as I don't have enough temperature controlled bog area at the moment. So, some will indeed be rotated in and out of the bog as it were. I do try not to let them dry out completely however. I had one scare when I first started this bog project of mine and that scare occurred when my Pereskiopsis started to appear shriveled up just a bit after several weeks in the bog. I immediately took them out of the bog and then replaced them back into the bog after that initial scare. I haven't had any problems with it since then.

I also let the water level fluctuate a bit, but I try not to submerge the leaves and if they are submerged I try not to submerge the leaves for more than a few hours as that can indeed spell trouble.

Here are some more bog pictures as they appear today.
Please note, while I have been experimenting with Trichocereus in the bog on their own roots, I rarely leave them submersed past the soil line for more than 12 hours and most of the time they simply sit in water 1-2 inches deep at most like you see in this last picture.

Really lovely man, what is your ph value like?
Those are some fat looking peresk leaves
 

Update on some of my bog-ponic cacti.

Update on bog-ponics. Picture taken today