I agree with Greg, the 2 branching montipora have the blunt ends so I don't think their digitata. Possibly samarensis. The 4th does look like my confusa too. Mine is about that size. I did just noticed the different colored polyps on the frist pic and I bet it is a variation of the rainbow monti. Mine has just now settled in and the polyps always have that cool different color thing going on.