Was there a filter in the tank? Also have you tested your water parameters?
(Should always be the first port of call if there is a problem).
Mel.

"Steve W" wrote in message
...
But why? The fish was a fairly standard goldfish with a nice comet type
tail. It was about two years old and shared an 18x12x12 tank with 5
Whitecloud. I've been feeding with Tetrafin.

The goldfish "jerome" has never exhibited any disease symptoms, no
whitespot, no finrot, no slime disease, no clamp fin. All the
Whitecloud have always demonstrated good health.

Over the last few weeks Jerome started to slow down and stopped feeding
over the past couple of days and is body (not fins though) started to
droop. Yesterday morning the fish was curled up on the bottom of the tank
barely alive. The gills were nice and bright. Now Jerome is dead.

I've not come across this before - and take his as a knock to personal
pride in my husbandry!

The Whitecloud are all perfectly fine exhibiting none of the symptoms.

Any ideas what this was?

TIA

Steve