Help with sick Discus

[Razoreqx]

My wife has a 120g freshwater tank with a pair of discus fish. Today when we woke up one of them seems to have lost its sense of balance and is flopping all over the place. The other fish is fine.

We also have in this tank about 7 small angle fish and 2 silver dollars. All of them are also fine. Checked ammonia levels, PH and water temp. Ammonia is zero.. PH was 7.1 and the water temp was 80...

Anyone know what this might be???

Thanks.

 

[Menagerie]

Possibly swim bladder disease. BrianNY keeps discus--PM him, he may have a better suggestion.

 

[Razoreqx]

thanks.. Im at work without PM access.. Hopefully the fish will hang in there until i get home from work..

 

[Menagerie]

These may also help--
Freshwater Diagnostic Charts:
http://www.aquatronicsonline.com/hobbyist/hobbyist3.htm
http://www.clubjungle.com/fish_chart.pdf