Quote Originally Posted by Renathras View Post
I'm trying to remember what I did that fight on. I think SCH or WHM...

AST has the lowest damage, but AnotherPerson's suggestions should work. I haven't ever heard of it being un-clearable, so it should be possible, but it might be pretty tight. I remember having to retry it on SCH or WHM (whichever I did it on) at the time and get my focus and damage CDs for it.
Having actually done it on AST myself , yes it possible, as I said earlier it's likely more easily done on any other healer - if someone wanted to stick to a healer.