Green Tetra Help

[Mflynn767]

My green tetra has been swimming on his side for a few days. At first he would just tilt a little bit to the side, but now has progressed to him swimming completely sideways and constantly circling. I spoke to a reputable pet shop and they had no idea what was wrong since he has no outward signs of disease. I immediately tried peas in case of swim bladder, which didn't help at all. I feel awful. This circling and sideways swimming has been going on for over a week and getting worse. If anyone has an idea of what this could be or any suggestions, it would be greatly appreaciated. He is in a 30 gallon tank with another green tetra, two X-ray catfish, 2 plattys, and 2 snails. I checked the water at home and all was perfect. I also brought a sample of water to the pet store to make sure and the ph, ammonia, and nitrates were all fine. Thanks.

 

[N0body Of The Goat]

Could the fish be orientating itself to natural light coming through the glass, because the tank is not using electric lighting in the lid?

 

[Mflynn767]

Not sure. He does it all the time regardless of the light being on or off. It's basically 24 hours a day he swims in circles. It's been such a long time. He eats and otherwise seems ok. But he is sideways constantly.