it is very very very hard to though IMO [unless it is misdirected]
the WRONG type of flow [powerhead/ pointed like a knife] is very easy to do.
THE turn over rates only apply if
1- deadspaces are not present,
2- rocks arn't trappign too much of it
3- it is the right type of flow
4- your reef is in the same age [not old and hard to get flow to type] etc.
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