Marcel it was in this tank. Sorry i cannot give you details on the group behaviour as i am only at the client for about 2.5 hours every second week. From what i see is that there is a pair swimming close together and the others are roaming. We obviously upset the whole works when we come with our water change and maintenance regime. I did not have a camera with me when this happened but this pic is similar to what happened with the urchin spawning/ pooing. Will upload later if i can find.
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[url]http://www.nemosjanitor.co.za/david%20d.html[/URL]