Sulky discus

[Red]

Help - my discus is sulking. Doesn't swim around just sulks round the filter all the time. What can I do to make it happy?

(4ft tank with a bunch of clown loaches and assorted other fish)

 

[FloridaFishGuy]

It could be many reasons why he is hiding in the corner. If he is the only Discus in the tank then you should add at least 2 more of the same size. It could also be that your water quality is not where it should be and he is stressed out.