Treat with prazi-pro and get a few hundred ghost shrimp. As everyone said, that bad boy is skinny as hell.
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Warm, clean water helps healing when combined with salt
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Raising the temperature will aid in healing open wounds,but all it will do with one in this poor state is add stress. Additionally, raising the temperature from 78-86 reduces the oxygen saturation from about 8.5mg/l to 7.5mg/l and adding salt will further reduce this number.
Getting the ray eating is #1 concern. It looks like it has not taken food for a long time. If the ray is still having to endure ammonia levels in your tank as you stated, that is another major issue that can be helped with more frequent small water changes.
Lights off, limit stress, get him eating.
