To the best of my ability:
1. A vitamin deficiency.
2. Possibly. Another is that the chemistry is out of balance.
3. Copper is a poison. It could have 'burned' some of the gill tissue. Depends how well the copper concentration was controlled and the kind of copper medication used. There can be other problems. Emphasize feeding the right kinds and quantities of foods. Read through this closely: Feeding Marine Fish and Fish Nutrition
4. Yes.
I would think there's a possible improvement you can do in general and that is find new homes for some of the fishes. The 20g as a display tank just isn't large enough for almost any marine fish beyond one that remain less than 3 inches in length for its entire life.
Stop the copper and hold the fish there for another 4 weeks to see if the Marine Ich returns.



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Post your fish care and health questions on the Reefland MARINE FISH: CARE, HEALTH AND DISEASE TREATMENT Forum.
Whether it is best for the fish, or not.


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