Great looking nano, reminds me of when I first started in salt water
! If you like the mushroom I would keep it where it is, still lots of room between the zoas and the shroom. I actually have a few species of zoas and mushrooms grown together and they are doing just fine.
As for your purple up make sure you use in very small portions, the product is pretty much a calcium supplement so over using it in a nano tank can throw your levels out of balance.
You a LoL player by any chance?