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Not to be the bearer of bad news, but there are a lot of things that can go bad. Intermittent "blindness" is usually a bad symptom. It can be caused by a lot of thing, but it is usually the start iof a downward spiral. If you can, try to increase the oxygen level in the water (more pumps, airstone, whatever you can), and keep the water as clean as possible.
Things to learn from this are to ALWAYS QUARANTINE, and try to do research on your fish selection. Clown tangs should not be kept in a 55 gallon, they are far too active and require very fast and oxygenated water. If it does pull through, it will grow quickly, and certainly outgrow your 55 gallon. Furthermore, clown tangs are known for having a poor survival record.
Good luck.
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