i have a bunch of echinophyllias, oxyporas, blastomussas, acanthastreas (echinatas and lords), leptoseris, and a trachyphyllia all in a custom 29 with a 6100 going. Just find the fleshier ones areas where they won't be blasted and they will get used to the flow.
My tank is sps and lps with about 60-110x's flow (depends on how I have the tunze running) and nothing is looking bad.
Zac