I think at least 5 branches at least 2 inches each would look like a mini-colony for a tabling acro. For a branching acropora, 5 inches with at least 3 branches, one of which at least 2 inches long is my arbitrary colony.
Its pretty subjective. However, the size of a "colony" has shrunk considerably over the years. Although I would argue against simply calling something that can be fragged a colony. There are a lot of folks out there fragging frags that are IMO mislabeled as colonies. IMO, a colony is at least the size of your fist or baseball and a "micro-colony" is about the size of a chicken egg.
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