What On Earth?

[WILDER]

Can you issolate the fish.
Never seen brown lumps or growths before in all the six years on forums.
If you can issolate you could maybe try a bacterial med.
But to be honest I think you are better getting advice from a vet.

 

[Hayleamorgan]

Can you issolate the fish.
Never seen brown lumps or growths before in all the six years on forums.
If you can issolate you could maybe try a bacterial med.
But to be honest I think you are better getting advice from a vet.

I have a 25 liter tank but no filter in it will it be okay without a filter if i do water changes? What meds shall i use?
Would you take the fish to the vets?

 

[nmonks]

Okay, yes, these sound like lymphocystis. Brown, textured growths. Very distinct from, say, finrot.

No treatment.

Not contagious.

Not dangerous.

Only common on "advanced" fish, typically marines, but also things like gobies.

Lymphocystis is not a disease in the sense of being "caught" by the fish. It's triggered by environmental issues, including water quality but also more difficult to test things like heavy metals. It takes months, even years, to clear up.

Best left alone, but do review maintenance of the aquarium and check whether you might have excess copper, heavy metals, etc. in the system (e.g., from your water supplier).

Cheers, Neale