Hi, I lost my Chagoi today, it was quite young (approx 5 inches), it was on the bottom of the pond yesterday and last night it was floating, when I looked closer it had a jelly like growth at the bottom of it's gills on one side, then today it had died, when I netted it there was a thumbnail size jelly like growth and it had a line of reddish/pink poo coming out of it.

Do you know what this could be and if my other fish might be at risk, I only have goldfish in the pond now.