I've found digitata to be very resilient for an sps. As long as the tip is not invaded by hair algae, the polyps should reencrust the ends. Mine have been knocked over more times than I'm embarrassed to count, but bounce back. I wouldn't worry too much about it & if you do cut off the tip, maybe cut off a little more & glue it down. You might end up with a second frag.
Anthony
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