I have 2 zebrasoma's (not Gems) in a 620 and they are constantly at each other. It would be foolish to risk a $3500 fish by housing 2 even in a 900 in my opinion.
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Jim G
President of Nebraska's premiere reef club
The Nebraska Reef Club
Current Tank Info: 620 Mixed Reef, 240 Acan Lord, 90 Zoanthid...I think that plenty for now
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