help indentify green 'bump' on fish belly

Crono

Black Skirt Tetra
MFK Member
Jun 15, 2022
49
10
13
how it started
buy new fish, quarantine. day later, white spot, add salt & meth blue.
few days later, white spot gone. to make sure, few day with only changing water, no medicine.

after the quarantine, grab the water from the main tank and add it to the quarantine tank. (yesterday perform)
in few hours, I spot fish spinning and 'sliding sideway', Internal parasite!?
change the quarantine tank water while adding medicine.

morning wake up, fish is dead (today happen). I spot green stuff under its belly, yet unable to find what it is.

the 2nd time dies. become sick after doing fine when in contact with the main tank.
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Kingdoffishcraft

Plecostomus
MFK Member
Sep 9, 2019
164
216
51
I don't recommend adding Walter White's goods to the tank but you do you. Joking aside it could be an algae growth due to a lack of mucus before they died. Could be because someone was sucking their skin or just a bit too much rubbing against rough surfaces.
 
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