Red phantom problem.

[kevfiz]

I have a red phantom that looks healthy but over the last day or so it has been acting strange. It stays in one corner of the tank at the front and keeps swimming to the side of tank and bumping of side. Apart from that it seems healthy. Any ideas?

 

[Colin_T]

can you post a short video of the fish acting strangely?
can you post a picture of the fish?
what other fish are in the tank?
how long has the tank been set up for?
how often do you do water changes and gravel cleans?
have you added any new fish during the last few weeks?