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Whats the name of the parasite, and how to handle it?

Thanks!

I have never seen that before. Are you sure it's a parasite and not a tumor or other growth?

Regards,
Eric

Hi Eric,
Thanks for your answer.
Im not sure its parasite, its might a desease. But its contagious, because i saw other ancistrus in this tank with the same.
The behavior total normal. Eating well etc.

Seems that ive got another ancistrus with smaller "parasite"/growth.

Any idea how to handle?

To me it looks like a mutiation on/of it's bristles, like a tumour(or something related to cell division, I don't know if that's the word not native English speaker) of sorts perhaps? Are the plecos siblings?

I saw ancistrus that have bristles that looks like full blown coral fungus and seems to never stop growing and this looks somewhat similiar.

Doubt there is much to do regardless and I don't think it's anything that is, per default, harmful.