Fungus?

[Behemoth]

hello about 3 weeks ago one of my balloon mollies died. before she died i would notice she would break out with fungus once a month and when she died she died of dropsy(it was a very old fish to and i know mollies are more likely to develope fungus). she was the mother fish and i have all her babies in the tank and they are all 1 year old. only 1 other fish got a small amount of fungus on it. every time there was an outbreak i always treated with fungus clear. i just recently put some aquarium salt in for the heck of it with my water change.
all of the fish in the tank now act fine, except i recently put a powerhead in, and i noticed that on 2 of my fish it seemed they had like a small white scale(probably a damaged scale)
all the fish eat and swim fine.
it's a 30 gallon tank, and i just had the water tested and all the levels were fine. i am just wondering if anyone might know what the white scale is, and if there is anyway to help the scale recover.

thanks in advance.

 

[WILDER]

Is the scale fluffy looking, any signs of flicking and rubbing.

 

[WILDER]

I would buy your own test kits in liquid form as if the fish was coming down with fungus once a month need to look at water quality.
How many gallons or litres is the tank, how many fish and which type

 

[Behemoth]

it's a 30 gallon tank
i got 7 balloon mollies ( they are about half and inch) very small
1 upside down catfish
1 algea eater
4 painted platy's
1 lyretail molly

only the mother fish which died, got fungus on here once a month. as soon as i scavenge up some money i will purchage my own test kit. all i have is an ammonia test, and the levels read normal.
no flicking or rubbing on the fish. it does look like the "scale" is starting to get better.
also i noticed on only a couple of the mollies under their gills is are shiny silver like color. it's been like that for a few months, i was curious to see if that was normal.
all of fish act as if they were healty, no rubbing, flicking , they all eat and all the tests results from the store were good.

 

[WILDER]

If the scale looks like it getting better, i wouldn't worry to much at this stage, good luck.