hmm
I have lost yumas of all sizes, hehehe. I'm only meant to keep ricordia I guess. My tank has perfect conditions and I've kept them in all areas (shady, hi light, low light, low flow, med flow) you name it and after a few weeks they just shrivel up. All my creatures are coral safe too so u got me.
I've had to satisfy myself with rare colors of sanctithomae mushrooms and pretend they're yumas.
Ricordia are very easy to keep and proly will even do well under pc's depending on the size of your tank.
I have found that when storing a whole bunch of ricordia in my 75 at one time they tend to get stressed out and I think its because that tank doesn't have a good skimmer on it. But I'm talking like 20+ 5x4" ricordia rocks. Other corals in the tank also tend to get stressed out when I have lots of ricordia in one tank, so I think they must put out quite a bit of toxins compared to other corals.
Other than that, I've never had any problems with them. They will do well in high - med light, high - low flow, it doesn't really matter. Some morphs even prefer lower lighting to higher lighting. They come in a rainbow of colors, every time I think I've seen it all, then I find something crazy.
They grow fast, most of mine just get really fat instead of splitting. Here's my all time favorite one that I saved for my husband's personal collection.