Flicking?

[Platygirl11]

Hi.
A few days ago, I noticed my fish flicking against decorations and gravel. They float near it, then swim fast against it. .
No other odd behaviors. I have added fish recently. What could be wrong?

 

[OldMan47]

Flicking like that is often an indication of an external parasite. Take a very close look at the fish that are doing it and see if you can spot anything on their skin or scales. One of the most common parasites we deal with is ich which could have come in on any new fish or even on new plants.

 

[Dave T]

Just following from oldman47 said about external parasite i had a bottle of anti white spot and i checked on reasons for use

comment on bottle use when fish are flicking and rubbing against objects

thought this might help shed some light for