Ok so I have just returned my angelfish back to the community tank after his prolapse and I was sitting watching him settle back in feeling please I actually managed to get a fish out of the hospital tank alive (my boyfriend has started to call it the death tank) when I noticed one of my cory cats is flicking
. Now I know this is some sort of internal thing but I can't remember what.. was it gill flukes?
Anyway could someone remind me what it is the symptom for? How to treat? And is it contagious (should i treat whole tank)? Also prognosis?
Ammonia= 0
Nitrite= 0
Nitrate= 40 (this is the level in the tap water as well)
pH= 8
Tank= 200l
Stocking= see sig.
No meds or any chemicals added to the tank.
Thanks!

Anyway could someone remind me what it is the symptom for? How to treat? And is it contagious (should i treat whole tank)? Also prognosis?
Ammonia= 0
Nitrite= 0
Nitrate= 40 (this is the level in the tap water as well)
pH= 8
Tank= 200l
Stocking= see sig.
No meds or any chemicals added to the tank.
Thanks!