This is one of those topics that everybody has an opinion on and it will be hard to get an agreement on as there are a lot of variables from the type of coral, to lights, to water clarity, to water flow and everything in between including fish and inverts which can affect coral extension
For me I feel water flow is important in coral extension as well as whether your coral rely on light or feed off what's in the water column
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 My aquarium is nothing but a smorgasbord for my cats.....
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