Lyretail Molly has salt like spots on tail

Question
I have 2 Lyretail mollies 1 male, 1 Female. 2 Cory's, 1 Albino, and 1 Peppered, and also 1 Clown Loach. The male molly has what looks like big salt specs on the lower part of his tail. I know it could be ick, or maybe fin rot. I have planted eclipse 10 gallon tank. I check the water chemistry regularly and it seems my tank has cycled because Nitrite normally is low to nothing, and Nitrate is minimal. I do water changes probably twice a week and normally the temp sits at 80 degrees. During feeding time the female molly seems to bully the male, and maybe the stress is causing his immune system to weaken. I know I should probably have one more female molly. Any advice would be appreciated.
On another note, I was wondering if the most tiny pinch of salt in the tank would hurt the Cory's or the loach? Also the loach seems to get along with the Cory's. Should I get another loach anyways so he has a buddy or is it possible for them to befriend the Cory's? Thanks for reading and I hope to hear from you soon.

Answer
Adam,                                                        If the specks spread or get worse ... definately treat you tank. I like coppersafe it treats for 30 days 1 teaspoon per 4 gallons. It will not hurt anyone else. You do not have to remove your carbon and it will not hurt the biowheel in there. Aquarium salt is cheap and very good for your babies. 1 tablespoon per 5 gallons. It relieves stress helps the rid their bodies of wastes and cuts their risk of becomming infected with parasites. Good stuff.As far as your clown he will love your corys soon enough. I wouldn't pair them in the particular tank you have they are very busy and that tank is small.You should be siphoning your rocks and doing water changes ony once a month, with new filter carbon, but if what you are doing works for you great.Your levels sound terrific. Yes if you add another female mollie it will probably keep her more occupied and away from your male. It doen't have to be the same kind of mollie.Good Luck, Tina