Angle-swimming tetra evened out

[chris]

Hi there,

I posted a while back about a black neon tetra that was swimming at an
upward angle of 45 degrees for a while. I wasn't over feeding, water
quality was good and I couldn't tell what the hell was going on. He
looks to be much better, eating again and swimming more normally,
however I noticed that his dorsal fin seemed to be torn. Could be be
getting beat up or could this be a sign of disease?

The rest of the fish seem fine and I'd like to add some more fish. Any
and all responses are greatly appreciated!

Chris

[chris]

No idea what could be going on here?

Chris

[Derek W. Benson]

On 25 Jul 2005 13:18:03 -0700, "chris" > wrote:

>Hi there,
>
>I posted a while back about a black neon tetra that was swimming at an
>upward angle of 45 degrees for a while. I wasn't over feeding, water
>quality was good and I couldn't tell what the hell was going on. He
>looks to be much better, eating again and swimming more normally,
>however I noticed that his dorsal fin seemed to be torn. Could be be
>getting beat up or could this be a sign of disease?
>
>The rest of the fish seem fine and I'd like to add some more fish. Any
>and all responses are greatly appreciated!
>
>Chris

Most likely one of the other fish has nipped him, taking a piece out
of the fin. Or in theory a small fish like this might possibly get
sucked onto the intake of your filter, in swimming away he leaves a
piece of the fin behind.

Usually a disease (bacterial) affecting the fins would be fin and tail
rot, but then the fins will start rotting inwards from the outside
edge which would also be white. So I don't think this torn fin is a
sign of disease.

-Derek