Colin: It's hard to say what was the cause of death. I do believe, however, that we will never know exactly what is required by this species or anything else in the ocean for that matter. Every day and with every new saltwater tank we, as hobbiests, scientists, and average ocean lovers get one step closer to discovering more about the fascinating lives of the creatures who live there. All we can do is take what we know and make adjustments in the future to see if they work better. I do look forward to the day which I can do this again and possibly even raise the babies to adulthood.