formalin solution for all type of parasite and fungal infection on aquarium fish

What is formalin used for in aquariums?
HOW IS FORMALIN USED IN AQUACULTURE? Formalin is used as a bath treatment to control external parasitic infections of fish. It is extremely effective against most protozoans, as well as some of the larger parasites such as monogenetic trematodes. Formalin effectively kills parasites on gills, skin, and fins.

[@souravsen5773]

Rock salt use korle kemon hoi?

[@Rahulsworld]

ওটা normal case a but situation খারাপ হলে tokn formalin use করতে হবে

[@sourabhpotadar1220]

Dada muje chaiye ye.. Kaysa doge??

[@Rahulsworld]

Online milajayega bro

[@biggaruddesly6015]

What

[@Rahulsworld]

?