Hello everyone.
There is an unknown disease outbreak now in my 90g tank.
It all starts when I introduced 10 green laser cory into my tank a few days ago. They were fine in the first day, but then start dying off, 2-3 a day. Now, only one is alive in the tank. The same disease seems to have spread to the other fish, as two of my 3 year old lemon tetra and a Juli cory is found dead as well.
Here is a photo of the dead juli cory.
Most fish died show similar symptom as this cory, with internal bleeding on the body. This is the first fish with an inflamed anus though. The first few green laser cory has a sullen belly (which I assume was parasite), but none of the other fish has the same symptoms. The fish are all fine the day before. They would swim around and actively search for food. It is only till a few hours before they died that they started frantically dashing around in the tank.
The tank was set up for months already, and there is no ammonia and nitrite, and 10-20 ppm nitrate. WC schedule is 50% per week.
I really have no idea what kind of disease I am facing here. The internal bleeding seems like bacterial infection, but the sullen belly and inflamed anus points to parasite. I can't decide which kind of med to use without knowing the nature of the disease. Please advise, thanks.
There is an unknown disease outbreak now in my 90g tank.
It all starts when I introduced 10 green laser cory into my tank a few days ago. They were fine in the first day, but then start dying off, 2-3 a day. Now, only one is alive in the tank. The same disease seems to have spread to the other fish, as two of my 3 year old lemon tetra and a Juli cory is found dead as well.
Here is a photo of the dead juli cory.
Most fish died show similar symptom as this cory, with internal bleeding on the body. This is the first fish with an inflamed anus though. The first few green laser cory has a sullen belly (which I assume was parasite), but none of the other fish has the same symptoms. The fish are all fine the day before. They would swim around and actively search for food. It is only till a few hours before they died that they started frantically dashing around in the tank.
The tank was set up for months already, and there is no ammonia and nitrite, and 10-20 ppm nitrate. WC schedule is 50% per week.
I really have no idea what kind of disease I am facing here. The internal bleeding seems like bacterial infection, but the sullen belly and inflamed anus points to parasite. I can't decide which kind of med to use without knowing the nature of the disease. Please advise, thanks.
