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Old 06/25/2014, 06:43 PM   #2
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Join Date: Mar 2013
Posts: 772
Are you sure they are the same species? frags are usually of dendros which have larger polyp heads - since they are branching they are generally easier to frag. Colonies tend to be Tubastraea colonies.

If they are the same species - it just may be the flow orientation. I have micranthus (black sun corals) on different parts of the tank - some stay open during the course of the day and other only open at night.

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