Masd. deformis

[Ross]

Adam, I think the mosses we are talking about are pH independent - ie. I doubt basic/acid is the thing that assures growth. I think high moisture levels, steady diets of fertilizer (weak is fine) and proper lighting are the key ingredients. I can tell you for sure the moss on my mounts just shows up by itself and if I spray Physan on the mounts to control algae or something else, then the moss turns yellow then brown till the next batch shows up. I have one mount totally covered in this moss and it's a beaut. The mosses you refer to over limestone are not the same moss shown in your photo. I'm not a geek on moss names, but I understand this one is related to aquatic mosses.