I've used the TechM treatment, twice on one tank, once on two other tanks. No loss of any shrimp, crabs, inverts, etc.
The reason I had to do it twice, on one tank, is because I didn't do it long enough, IMO. The second time around, I did it longer. I've not had any Bryopsis issues, in any tank, since.
My observations, on bleaching issues...
Yes, it will bleach some corals, BUT, they will all return to their previous color, though it'll take awhile.
Here are corals that bleached, for me.
Turbinaria Scroll Coral (1st time, NOT second...I'll explain more later)
Several Zoanthids (1st time, not second)
1 of several Pocillopora (this colony received more light than the others)
A couple of Echinophyllia and an Acan (1st time, not second)
Majano anemone bleached, but did not die...Grrr. (Only some Majanos bleached, which will be explained in a bit)
Turf Algae bleached AND DIED!! (again, only some of it....)
Okay, my belief is that the bleaching, and death of Turf Algae, is light related.
ALL of the corals that bleached, the first time, were receiving direct light. The second time, all of those same corals were moved, to shaded areas of the tank, and experience NO bleaching at all.
The Majanos that bleached, were ALL Majanos that received direct light. Majanos that were shaded, were not effected.
Turf Algae that died, was high in the tank, receiving direct light. It bleached and then dissolved. Turf Algae that is in shaded areas did not bleach or die, and was completely uneffected.
I'm almost positive that there's some correlation, between the TechM chemicals, and photosynthesis, causing some life forms that receive lots of light, to be negatively effected.
No other SPS, all of which receive direct/high light, were effected at all.