8 year old silver arowana pinkish growth.

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W

woodsexotics

Feeder Fish
Jun 23, 2025
3
0
1
36
Claremore, ok
Have you tested your water?
Yes
If yes, what is your ammonia?
0
If yes, what is your nitrite?
0
If yes, what is your nitrate?
38
If I did not test my water...
  1. ...I recognize that I will likely be asked to do a test, and that water tests are critical for solving freshwater health problems.
Do you do water changes?
Yes
If I do not change my water...
  1. ...I recognize that I will likely be recommended to do a water change, and water changes are critical for preventing future freshwater health problems.
Hello, been keeping arowana for about 12 years and I have never seen anything like this so figured I would post about it.
Check out photo if the issue.
Silver though an ugly specimen has been with me for almost 8 years and is around 32-34 inches long.
I noticed this about an hour ago and I keep very close eyes on all my fish. I did not notice this until today.
This one is housed in a 600 gallon aquarium with a 150 gallon sump.
Water parameters are 38ppm nitrates, ammonia 0, nitrite 0, ph around 7. It is on an auto drip system that I tune the nitrates to stay in between 30-40 ppm.
Im going to start treatment with salt with around 500 ppm while im doing more research.
My question is, does anyone reconize this and if so what is the recommended treatment?

Thank you.

413.jpg
 
It could be Lymphocystis. This is caused by a virus and to my knowledge is untreatable. It will not necessarily kill the fish. But it can spread.
More tumors.
I had a peacock bass that had Lymphocystis. It did not spread to other fish. This peacock bass had other health issues so I think the immune system was compromised. Of course stress doesn't help. Stress just accelerates the health problems.
My peacock bass got this disease when about 6 years old.
 
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LBDave said:
It could be Lymphocystis. This is caused by a virus and to my knowledge is untreatable. It will not necessarily kill the fish. But it can spread.
More tumors.
I had a peacock bass that had Lymphocystis. It did not spread to other fish. This peacock bass had other health issues so I think the immune system was compromised. Of course stress doesn't help. Stress just accelerates the health problems.
My peacock bass got this disease when about 6 years old.
Click to expand...
Well I hope not, but thanks for the input. I will update you, but I did notice that today she looked like she was seeing her reflexion in the bottom glass and it seemed like she was trying to swim lower, maybe to get to the other "fish"? I did switch some things around on the bottom of the aquarium. when she was swimming, I noticed the part if her with the issue was the exact place that was rubbing against the glass.
After she saw me she quit and started swimming like normal.
So I hope it's just from running against the glass but it does look odd.
 
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