diseased fish

Can anyone give me insight as to why my goldfish is doing this?! The lil guy is hanging out in the back corner vertically. He is also breathing very heavily. He is usually very active. If anyone has suggestions to what is causing this and how to fix it it would be greatly appreciated! :)

Hi guys, pretty sad day, my male fighter (bean) who was just starting get some really cool koi patterns just died, I only noticed him acting lethargic and not eating a day or 2 ago. And the redness pictured has slowly developed, since yesterday, getting really big today. pH, ammonia and nitrite...

I was doing a water change yesterday on my cichlid tank (75g, with 5 African cichlids, not 100% sure of specific fish names) and I noticed this little guy. I quickly got him out and placed him in a hospital tank. Before I did my water change the parameters in the 75g were: Temp: 80 F (26.6 C)...

Today i noticed protruding scales on my platy and i immediately changed it into another tank, However, fish seems healthy for me and no swollen belly. Is that the sign of dropsy. What are the effective methods to cure the disease. And how to stop spreading the disease to other fish

Please help me!!! I bought this wonderful OB peacock at the size of one inch, now he is about 7 inches. I have only had him for about a year now, and he is the tank boss, he is the only male with three females and a bunch of fry. Yesterday he started to develop cataracts, one eye was slightly...