4 and 5 are definately ricordia, 6 likely is, and 8 looks like a blue colored ricordia (could tell with clearer pic, but I think I do see little armatures coming off of the disc), which isnt as common as the green ones you have on the rock as well.
6 could be somethig entirely differant though, hard to tell in this pic
I would seperate them if you can, allow room for splitting and growing, the ricordia can measure up to 3 inches across with the lights on if in the proper low flow area of the tank, and I would imagine the mushroom 1 would get at least as large as well