Regarding yogurt, I have an old text that suggest using milk (whole) and moss in a blender and then paint that over a stone or whatever you want to moss, and keep it cool and wet for the next 2 weeks.
So Ole's suggestion is spot on, different milk product, but very similar, smells like Hell in your aquarium though, better to do the aquarium water.
Yea, I've done it out side, would never stink the home up inside, you can get evicted for that type of stuff. Japanese landscape stones that need some moss to look aged get this treatment FYI.
I've grown moss outside in bonsai for years. I'll take a new pic of that same Juniper and you can see if I'm good at what I do.
The entire thing is covered. And it's pretty dry in California.
DSM folks run into trouble when they go 100% humidity. Fungus, soil algae etc.
We find moss on trees, all over here, but only when its cooler and has been wet, but it'll grow well in between also, just do not let it get too dry at first, so maybe good 100% humidity initially, but not more than a week or two.
Darrel's suggestion is good, you do not need to totally uncover the DSM, just leave a small gap, this will exchange CO2/O2 in/out of the tank.
I leave a small gap in any DSM I've done, this improves everything and reduces the mold/algae issues. I have some Buce's, maybe 1000$ worth, sitting in a simple tupperware tray that has some holes on the bottom of the lid, plenty of air/in/out etc.
This sits right on top on my 70Gal next to the t5's, plenty of heat and light. Those are Buce's, not moss. Moss is wimpy initially. I wet it out 1-2x a day and place in indirect sunlight, never direct. After 2 weeks, then you can move it.
Adding CO2 to a DMS is a waste of time IME. I tried it on many species when I had a 55 Gallon emergent tank for 3 years or so. Remember, CO2 is heavier than air, and no O2= bad for plants in a sealed DSM.
So a little exchange, not a 100% sealed, is best. What species of moss are you using?
Something like xmas, bulletproof, Fissidens works very well with the method I just suggested. The end result is far better than taking submersed grown Fissidens and then tying to wood and hoping it stays put with cotton thread
Fissidens and many species of moss require a DSM for good attachment it seems. I might be wrong, but I've never seen it attach so well unless a DSM was done.
I have not yet tried this with Mini Pellia, but I certainly plan to.
Cut each piece of moss with a razor? Will Ole come to your home to help you do that fun chore from Hades? haha, I think not, to the blender with your green protein moss shake!