I often see threads where hobbyists are searching for help with identifying an Acropora species. When I look at the photos, I usually see an Acropora, nothing more than that. So, how can some hobbyists differentiate between a tenuis, a vermiculata, a horrida, and others? Does it just take practice, or are there specific features that stand out to those that know what to look for? I think that it's even more difficult for me when I'm trying to identify frags rather than colonies, but I want to understand so that I can get better at identifying species of Acropora.