Dead Sword, sick Molly..heres what I am doing..is it right?

20 gal tank
3 Black Molly's (One female with a white fungus)
1 male sword (the female died 2 days ago)
4 tetras
1 Pleco
2 Clown Loaches

1 real plant (dont know what it is, its long and skinny and grows p and
floats around the tank.

All readings are in the green except water hardness which shows the water to
be hard.

Tonight I removed the charcoal filter and added Ick Away to the tank. About
5ml per 10 gal as instructed but its hard to tell exactly. Tomorow night I
plan on a 50% water change and plan on doing this same Ick Away and water
change for 3 consecutive days. I am hoping this will save the Molly and keep
any other fish from dying.

Anything else I should do? Or not do?

Thanks in advance
Jeff