IME, when mushrooms aren't happy with where they are they will shrivel and or not open. Perhaps, it is getting way too much flow? When mushrooms get too much flow, they aren't able to open fully. Did you just get the mushrooms? What kind of lighting do you have? Maybe you need to acclimate them to more powerful lighting if that is what you have; they might be used to less intense lighting. I think that may possibly attribute to the bleaching as well.