the grafting technique is interchangeable between species of cacti (just make sure the vascular rings overlap. keep it humid but not enough so for anything to rot)
a lot of people make tents with close to 90% humidity, but every time i tried that i got rot, the best results i have had was just in my house (which is admittedly humid as fuck, ranging from 50-70%).
also if you are grafting to expedite the growth of your lophophora, you can't go wrong with pereskiopsis.
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