Side of fish bursting periodically after swelling

[SandyinVA]

This is about to happen for the third time in the last three to four weeks to one of my fish. I forgot what kind, I have had him for two years, Silver elongated body with orange fins, black near the tail, about 3 inches long.

This fish developed swelling on one side, as if something was growing under his skin, you could see it bulging; it literally burst on that side, some grayish matter fell out to the bottom of the tank. The gap was almost 1/2 an inch in diameter. By the next day it was nearly healed over. I thought maybe it was a cancer. It is about to happen again same spot in the next day or two. I added melafix to the water. I have no idea what this is and no one at my fish shop is familiar with it.

The fish remains active, and eats well.

 

[Sasha]

What is the ammonia, nitrate, nitrite and pH?

Can you get a picture of the fish? That might help us out a little.

to the forum too!

 

[Spilk]

Did you remove the grey matter and quarantine him? Sounds like it could be a parasite!

 

[WILDER]

Add some salt to the tank if you have no scaless fish, do some salt baths on the affected fish, good luck.

 

[Lynz781]

cold or tropical? sounds like a goldfish to me.

 

[SandyinVA]

I stupidly have not quarantined him, although no one else is having any difficulty. There have been no new fish this year. I think he might be a danio. I will swing by the shoppe and see if they still carry them. PH was a little low 6.5, no ammonia or nitrates, water tested hard, ok for cichlids, etc.

It has burst again since i last posted. I have a very small population right now consisting of 6 fish, all 3 to 4 years old. No one has had a problem in 1 1/2 years since my algae eaters died.

 

[WILDER]

Get an anti internal bacteria med also .