I’ve been messing with the flow a lot in my tank and right now the flow on my Duncan coral is super strong the tenticals look great but when they get a big gush every once in awhile a few heads close. This normal will the adjust to the flow I’d hate to move the flow because all my other corals love it my bubble tip nem looks better than it has in a while
They don’t require high flow or full polyp extension will not be evident. Low to moderate at best for these LPS corals. Make sure you target feed them for best results! If you don’t get full polyp extension then your flow is too strong! That is the nice thing about corals! They will let you know if they are happy or stressed and on the brink of dying.