Hi, thanks for the advice. Its been 10 days now (I think) but my
Ryukin is still 'sulking'. She is eating fine but still just 'camping'
out in the middle of the tank. She occasionally wanders around for a
minute but then comes back to the same position. Her fins are working
and she is there of her own accord. The doesn't appear to be any
floating.

I have been changing my water twice weekly doing 10% at one change and
25% on another. I did a water test yesterday and had ammonia 0
Nitrites 0 and Nitrates 30ppm. I did a 25% water change so hoping that
it isn't that. She is still at the center of the tank.

Thought that it might have just been a reaction to the introduction of
our Black Moor. Still she seems to be the only one behaving like this.
The other 3 fish are doing well. My Ryukin really doen't look
'sickly'. No marks on scales or fins. Her colour is a white pearl
colour, which looks awesome, and she looks really good.

Could it be that she just likes 'sitting' in the middle of the tank?
Am I worrying for nothing? :-)

Cheers
Mellie