Thanks for the update. I listed a few things to try in the email response to you so i won't go into details about that here. To address the cyanide question, you really have to know the history of this angel. They are collected in Guam by a small handful of people. Cyanide is never used in their collection and the inherent problem with the collection of this angel is decompression. They are a deep water angel so they have to be brought to the surface incredibly slow. Decompression issues manifest very quickly however and the fact that particular fish had been with us so long and now with you a few weeks is an indicator that it is not decompression or cyanide.
One thing to mention about deep water fish in general is their complete intolerance of chemistry changes in aquariums. Reef associated fish which are collected close to the surface have adapted the ability to roll with the punches over time. The surface water can fluctuate in temperature, salinity and sometimes pH. These fluctuations are very common in our aquariums as well, especially with small aquariums less than a few hundred gallons. In depths of 150-300 feet, these parameters change far slower if at all. Most deep water fish have not developed the internal mechanisms to handle these parameter changes well. They end up becoming very stressed when changes to these parameters take place.
The trick becomes keeping what we call the big three (temp, salinity, pH) as stable as possible to avoid putting stress on deep water wish which have never adapted to these parameters changing even a little bit.
Keep us posted on how things go. Take care.
I have been trying everything I can think of and it continues to get thinner.
