What is this thing on the tail of my rasbora?

clutches

Hello,

I need help identifying the white spot on the tail of one of my rasboras. I noticed it yesterday while I was doing a water change. All fish look healthy otherwise.. even that one eats and behaves normally. Thanks for the help in advance.

Some info on my tank

General
20 gallon tank, around 1 year old.
No new fish for several months now. Last addition was the Dwarf Gourami about 4 months ago with 3 rasboras.
The affected rasbora has been with me for over a year

Water Params
Ammonia & Nitrite = 0ppm
Nitrate = 5ppm

Stocking
10 Harlequin Rasboras
6 Otocinclus Catfish
4 Amano Shrimp
1 Red Fire Dwarf Gourami (female)
 

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