OK, this one's been bugging me since I couldn't remember. I hit the bookas and came up with a few possibilities. Try Google-ing the following and see what best fits your piece:
Acropora Ocellata
Acropora Nasuta
Acropora Gemmifera
Acropora Humilis
Acropora Digitifera
Humilis was my original thought and what I was trying to remember, but after looking around a bit...
And by had to keep healthy I didn't mean bad coral, just a more difficult species at least in my experience in killing them. 80
HTH,
R-
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