White patch on the lips of black molly

[Pradyumnaha]

Hi all. I am pretty new to fish keeping hobby and need help in identifying the disease and curing my molly.
I bought a black sailfin molly a week ago. Second day in the tank I observed a white patch on the lips (picture attached). I did my research but I was not sure if it a bruise caused by bumping into something or if it is cotton mouth/mouth rot disease.
I waited for couple of days but the white patch was still there. It did not increase/spread either. Then I treated whole tank with “eSHa 2000” medicine as the recommended standard dosage for 3 days (ending today). Even now I don’t see any spreading but no improvements either.

Fish is active and swimming nicely all over the tank even though it is eating very less food (still eating though as it is new fish I think it is taking time to settle in).

Tank is setup 2 months ago. All other fishes are fine and happy from past 1 and half months.

 

[Colin_T]

Hi and welcome to the forum

It looks like excess mucous produced by the fish to cover an injury. The best treatment is clean water and salt. Add 2 heaped tablespoons of rock salt for every 20 litres of tank water. Keep salt in there for 2 weeks and see how it goes.

Check your water quality for ammonia, nitrite, nitrate, pH and GH.
Mollies need a pH above 7.0 and a GH above 250ppm.
Harlequin rasboras come from water with a pH below 7.0 and a GH below 100ppm.

 

[itiwhetu]

Let us know how you get on, please