mushroom safe corals

[skabooya]

I know that they shouldnt touch but my tank isint that big. Its a 28gal long 36".
I was thinking of getting 2 or 3 coral lps coral. My tank is mainly a softy tank but i didnt want the lps to hurt my mushrooms or zoas.
I could put an lps (hammer or frogspawn or torch) in either corner of my tank where the water flow blows their sweepers to the corners. But its not a strong flow. I was also thinking of a candy cane up at the top of the tank if the sweepers were not that long so as to stretch and touch the mushrooms/rics etc growing around it.

What do you think. would i be safe? Which is the nastyiest lps i mentioned for killing softies.

Also what tall softy could i use for the top of my aquarium that can have mushrooms fairly close to them. By close i mean possibly touching.