Tumour On Blue Acara?

[SouthernCross]

My blue acara has a big lump, about the size of a pea at the base of his tail, just before the fin starts. I don't really know what I can do about it exactly, just wondering if anyone's fish ever had anything like this, did the fish get better or is it likely to kill him with time? I suppose it's been there a few weeks now. The fish isn't acting sick.

Wondering if it's some kind of tumour? Any thoughts?

 

[star4]

Quite possibly a tumour, or an abcess under the scales. Without a biopsy its pretty difficult to tell, personally I would just leave it alone. One of my tetremerus has a similar looking lump in the same place, she has had it for 3 years + now thankfully it stopped growing.

 

[SouthernCross]

It seems to be getting bigger and is very dark.