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dvsgp6 .... i'm not pretty sure what exactly happened to him. two possibilities happened either his trying to jump and hit his top in your lid or he got a decease.
One thing for sure you gotta start changing your water @ least 10% ever 4 days this way new fresh oxygen and beneficial bacteria can grow.
And when you change your water turn off the lights to keep the stress level low.
anyway i have some note for you...
i hope this will help you...
1. 'Red Spots' Disease
This is often regarded as a terminal disease and it affects mostly young fishes.
Symptoms
Red spots occur on the lower back portion of the body. Early stage - patches of red spots, gradually swelling occurs, scales are upturned and finally the fish may slowly rot to death.
Cure
Try increasing temperature to 36°C plus bathing it with fish medications available commercially.
2. Protruding Scales Disease
This often occurs when Dragon Fish is young. The adult Dragon Fish seldom gets affected by this disease.
Cause
Events causing extreme temperature changes within the aquarium.
Contaminated water.
Symptoms
Initial stage - Scales tilt at every 5th to 8th scale. Blood traces may be seen at the root of scales. If not arrested at this stage, scales will gradually tilt, redness may appear and the scales will not be able to protect body causing bacteria attacks to the body of the Dragon Fish. The scales may all drop off causing the body to decay and the fish to die.
Cure
Add coarse salt and increase temperature to 32°C to 34°C. Increase oxygen content in the water and change water (1/4) every 3 to 4 days. Water may be heated prior to change. Add copper sulfate medications to the water.