Why Are My Fish Swimming On Their Sides?

[Hagrid66]

Hi guys another question

A few of my fish in my tank are swimming on a slight tilt. My friend recently had her fish swimming in circles and discovered that her PH was too low. Any Ideas?
Hagrid66 x

 

[OldMan47]

Have a look at the angle they are swimming on. Does it happen to match the direction of a strong light source? Many of our fish have no sense of balance but instead right themselves to the dominant light source that they are exposed to. I have angels that never swim straight up and down except when I have the overhead light in the tank on. When it is only room lighting, they are at all kinds of odd angles

 

[Curiosity101]

Gotta go with OM on this. I've often found my fish on a slight angle in a morning. The angle themselves towards the morning light coming through the door.

 

[Hagrid66]

Thanks guys, I'll check the light!
Hagrid66

 

[Gilli]

Would these be tetras by any chance? If so they are displaying to each other and do this by swimming at an
angle!